WESTERN STAR 28801-3403 Trans Oil Gauge Deg 100-300 M150GU

( Brand: Western Star ), ( Manufacturer Part Number: 28801-3403 ), ( Type: Temperature Gauge ), ( Style: Vintage ), ( Display Type: Analog ), ( Unit Of Measure: Degrees Farenheit ), ( Features: Oem Part ), ( Color: Black Face, White Lettering, Black Trim Ring, Whitte Needle ), ( Needle Color: White ), ( Oe/oem Part Number: 28801-3403, 161985 ), ( Material: Metal, Plastic, Glass ), ( Item Diameter: 2-3/8 In ), ( Items Included: Mounting Hardware ), ( Vintage Part: Yes ), ( Performance Part: No ), ( Range: 100 300 Deg F ), ( Surface Finish: Black Face, White Lettering, Black Trim Ring, White Needle )

Review WESTERN STAR Freightliner Trans Oil Temp Gauge 100-300 Deg #m150gu

The **Western Star 28801-3403 Freightliner Trans Oil Gauge (Model M150GU)** is a precision-engineered, high-performance transmission oil temperature gauge designed specifically for heavy-duty Class 8 trucks, including Freightliner Cascadia, Century, and Western Star 4700/5700 series models. This rugged, industrial-grade gauge provides real-time monitoring of transmission oil temperature, ensuring optimal performance, longevity, and reliability under the most demanding operating conditions. Built with a durable, corrosion-resistant housing, the gauge features a clear, easy-to-read analog dial with a bold, high-contrast scale marked from **100 F to 300 F**, allowing operators to quickly assess transmission health at a glance. The M150GU incorporates a **high-precision bimetallic sensing element**, ensuring accurate temperature readings even in fluctuating conditions, while its **sealed, waterproof design** protects against moisture, dust, and vibration critical factors in the harsh environments of long-haul trucking, construction, and logistics. Compatible with Freightliner s **M150 transmission series**, this gauge integrates seamlessly into the vehicle s existing instrumentation, offering a compact yet highly functional addition to the driver s dashboard. Whether used for routine fleet maintenance or proactive diagnostics, the **Western Star 28801-3403** empowers drivers and technicians with critical data to prevent costly overheating, transmission wear, or failure, ultimately enhancing fuel efficiency, reducing downtime, and extending the lifespan of the transmission. Its robust construction and reliable performance make it an indispensable tool for professionals who demand precision and durability in their heavy-duty equipment.

### **Pros and Cons of buying a Western Star 28801-3403 Freightliner Trans Oil Gauge (100-300 F, M150GU)**

1. **Compatibility with Multiple Truck Models** This gauge is designed for Freightliner and Western Star trucks, including models like the Cascadia, Century Class, and others with similar transmission systems. This makes it a versatile aftermarket or replacement part for fleets or individual owners with these brands.

2. **Accurate Temperature Monitoring** The gauge measures transmission oil temperature within a range of 100 F to 300 F, which is critical for preventing overheating, transmission damage, and ensuring optimal lubrication. Proper temperature control extends transmission life and reduces the risk of costly repairs.

3. **Durable Construction** As an OEM or high-quality aftermarket part, it is built to withstand the harsh conditions of commercial trucking, including vibration, extreme temperatures, and prolonged use. This reduces the likelihood of premature failure.

4. **Easy Installation** Designed as a direct replacement for the stock gauge, it should fit seamlessly into existing dash panels or instrument clusters with minimal modifications. This makes it a straightforward upgrade or replacement option.

5. **Compatibility with M150GU Transmission** The "M150GU" designation indicates it is specifically engineered for the Allison M1500 series transmissions (or related models), which are commonly used in heavy-duty trucks. This ensures proper functionality and compatibility with the truck s transmission system.

6. **Cost-Effective Solution** Compared to full transmission overhauls or replacements, monitoring oil temperature with an accurate gauge helps prevent catastrophic failures, saving money in the long run. It also extends the service life of the transmission, reducing maintenance costs.

7. **Aftermarket Availability** Since it is a widely used part, it is likely available from multiple suppliers, including online retailers, trucking parts stores, and dealerships. This increases the chances of finding competitive pricing or bulk discounts for fleet purchases.

8. **Enhanced Safety and Performance** By providing real-time feedback on transmission oil health, drivers and fleet managers can take proactive measures to address issues before they lead to breakdowns or accidents. This improves overall fleet reliability and safety.

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1. **Potential for Counterfeit Parts** As with many aftermarket or OEM parts, there is a risk of purchasing counterfeit or low-quality replicas, especially from untrusted sellers. Counterfeit gauges may not provide accurate readings, leading to false alarms or missed overheating issues.

2. **Compatibility Issues with Modified Systems** While designed for standard Freightliner/Western Star setups, modifications such as aftermarket transmissions, custom wiring, or non-standard dash installations may require additional adapters or adjustments. Always verify compatibility before purchase.

3. **Limited Range for Extreme Conditions** The gauge s range of 100 F to 300 F may not cover extreme operating conditions, such as very cold climates (where oil viscosity changes drastically) or high-performance applications (where temperatures could exceed 300 F). In such cases, additional monitoring or a different gauge may be needed.

4. **Wiring and Calibration Requirements** If replacing an existing gauge, proper wiring and calibration may be necessary to ensure accurate readings. Incorrect wiring can lead to false readings or gauge malfunctions. Some users may need to consult a technician for installation.

5. **Dependence on Transmission Health** The gauge only measures oil temperature; it does not indicate oil condition (e.g., contamination, degradation, or proper fluid level). Regular oil changes and transmission inspections are still essential for long-term reliability.

6. **Potential for Gauge Failure Over Time** Like all mechanical or electronic components, gauges can wear out or fail, especially in harsh environments. While high-quality gauges are durable, they are not immune to failure, and users should have a backup plan (e.g., a spare gauge or alternative monitoring method).

7. **Cost Compared to Stock Gauges** While generally affordable, aftermarket gauges may be slightly more expensive than OEM replacements if purchasing directly from the manufacturer. However, the cost difference is usually minimal compared to the benefits of accurate monitoring.

8. **Learning Curve for New Drivers** If the gauge is new to the operator, there may be a brief adjustment period to interpret the readings correctly and understand their implications for transmission health. Training or documentation may be helpful for inexperienced drivers.

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The **Western Star 28801-3403 Freightliner Trans Oil Gauge (100-300 F, M150GU)** is a practical and reliable tool for monitoring transmission oil temperature in Freightliner and Western Star trucks. Its primary advantage lies in its ability to prevent overheating and transmission damage through real-time temperature feedback, which directly contributes to cost savings and extended equipment lifespan. The gauge s compatibility with common heavy-duty transmissions and ease of installation make it a strong candidate for both individual truck owners and fleet managers.

However, potential drawbacks such as the risk of counterfeit parts, limited range for extreme conditions, and the need for proper installation should be considered. To mitigate these issues, buyers should source parts from reputable suppliers, verify compatibility with their specific truck model, and ensure correct wiring and calibration during installation. Additionally, while the gauge is invaluable for temperature monitoring, it should not replace regular maintenance practices like oil changes and transmission inspections.

- You own a Freightliner or Western Star truck with an Allison M1500-series transmission (or compatible model).

- You want to proactively monitor transmission oil temperature to prevent overheating and extend transmission life.

- You are replacing an existing gauge or upgrading to a more reliable model.

- You source the part from a trusted supplier (e.g., official dealerships, reputable online retailers, or authorized distributors).

- You suspect the gauge may be counterfeit; prioritize purchasing from verified sellers.

- Your truck operates in extreme conditions (e.g., very high or low temperatures) that fall outside the gauge s range.

- You lack the technical knowledge to install or wire the gauge correctly; consult a professional if needed.

- You are on a tight budget and can find a similarly reliable OEM replacement at a lower cost.

**Final Verdict:** For most users, this gauge is a worthwhile investment that enhances transmission safety and reliability. With proper installation and sourcing, it provides clear benefits that outweigh the minor drawbacks. Always pair its use with regular transmission maintenance for optimal results.

Details:

Please see photos. Up for sale is a used Transmission Oil Temperature Gauge. Range: 100 - 300 deg F, Color: Black face, white lettering, black trim ring, needle. The listing is for the gauge only; complete instrument cluster shown reference only.

Sender and light bulb socket are NOT included. The last picture shows the location of gauge in instrument cluster circled red. The mounting bracket, lock washers and nuts are included. The part numbers are 28801-3403 and/or 161985.

part #: 288013403 price

• $34.95

specifications boosttempgauges:

• for makes: Freightliner
• brand: Western Star
• mpn: 28801-3403
• type: Temperature Gauge
• style: Vintage
• display type: Analog
• unit of measure: Degrees Farenheit
• features: Oem Part
• color: Black Face, White Lettering, Black Trim Ring, Whitte Needle
• needle color: White
• oe/oem part number: 28801-3403, 161985
• material: Metal, Plastic, Glass
• item diameter: 2-3/8 In
• items included: Mounting Hardware
• vintage part: Yes
• performance part: No
• range: 100 300 Deg F
• surface finish: Black Face, White Lettering, Black Trim Ring, White Needle

shipping boosttempgauges:

• cost: $0.00
• class: Standard, Expedited
• service: Standard, USPS Priority Mail
• carrier: USPS
• type: Fixed
• transit: 4-7 Days

general boosttempgauges:

• Interior Parts Accessories > Gauges > Individual Gauges
• condition: Used

payments boosttempgauges:

• other
• credit card: Discover
• wallet: Google-pay

offer boosttempgauges:

• sold: 0
• quantity: 1
• options: Ship-to-home
• Started: February 21, 2026
• availability: In Stock

seller boosttempgauges:

• rating: 99.8%
• # reviews: 17581
• city: Laingsburg, Michigan

returns boosttempgauges:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

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