Frequently Asked Questions About Kenworth W900A Gauges & Switches

Will these gauges and switches fit my specific year Kenworth W900A?

Most aftermarket gauges and switches for the W900A are designed to fit models from 1961-1985. However, there can be variations in dash configurations between early models (1961-1970) and later models (1971-1985). Always verify the specific year range listed in the product description, and pay attention to whether your truck has a steel dash or fiberglass dash, as mounting requirements may differ. When in doubt, contact us with your VIN and we can help confirm compatibility.

Do I need special wiring or adapters to install aftermarket gauges?

Most replacement gauges come with standard connections that match OEM wiring, but you may need sending units for mechanical gauges (oil pressure, water temperature) if replacing electric gauges with mechanical ones. Electric gauges typically require 12V power, ground, and signal wire connections. We recommend having a basic wiring diagram for your specific year W900A and a multimeter for installation. Some customers find it helpful to label existing wires before removal.

What's the difference between mechanical and electric gauges, and which should I choose?

Mechanical gauges use direct pressure or temperature readings via tubes or capillaries and are known for accuracy and reliability but require routing lines through the firewall. Electric gauges use sending units and wiring, making installation cleaner but requiring good electrical connections. Most W900A owners prefer mechanical for critical readings like oil pressure and temperature due to their proven reliability and immediate response. Electric gauges work well for voltmeters and fuel gauges.

Can I mix different gauge brands or styles in my dash?

Yes, you can mix brands, but for the best appearance, stick with gauges that have similar bezels, face styles, and lighting. Popular combinations include using VDO or Stewart Warner for critical engine gauges while keeping original-style gauges for less critical functions. Pay attention to gauge sizes - standard W900A openings are typically 2-1/16" or 2-5/8". Matching the illumination color (usually green or amber for vintage W900As) helps maintain a cohesive look.

My toggle switches keep failing - what heavy-duty replacements do you recommend?

OEM-style toggle switches on W900As are prone to wear, especially for high-use functions like lights and accessories. Look for switches rated at minimum 20-25 amps for lighting circuits and 30+ amps for auxiliary equipment. Sealed marine-grade toggles or Cole Hersee heavy-duty switches are popular upgrades that handle vibration and moisture better than standard switches. Always match the switch configuration (SPST, DPDT, etc.) to your original and consider adding inline fuses for protection.