Frequently Asked Questions About Freightliner Century 112/120 Gauges & Switches

Will these gauges fit my specific year model Century truck?

Most aftermarket gauges and switches for the Century 112/120 are designed to fit models from 1996 to 2011. However, there are some variations between early models (1996-2004) and later models (2005-2011), particularly in dash panel configurations and electrical connectors. Always verify the specific year range listed for each product, and when in doubt, provide your VIN number when ordering to ensure proper fitment.

Do I need special tools or professional installation for gauge replacement?

Basic gauge replacement typically requires standard hand tools including screwdrivers, socket sets, and panel removal tools. Most gauges are plug-and-play with existing wiring harnesses. However, adding new gauges that weren't factory-installed may require drilling mounting holes and running new wiring. We recommend having a multimeter on hand to verify connections. Installation usually takes 30-60 minutes per gauge for someone with basic mechanical skills.

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

Mechanical gauges use direct physical connections (like capillary tubes for temperature) and tend to be more accurate but harder to install. Electric gauges use sending units and are easier to install but require proper grounding and may need calibration. For Century trucks, electric gauges are more common and recommended for most applications, especially for oil pressure and temperature readings, as they integrate better with existing electrical systems.

Are aftermarket gauges as reliable as OEM Freightliner gauges?

Quality aftermarket gauges from reputable manufacturers like VDO, Stewart Warner, and Medallion often match or exceed OEM specifications. Look for gauges with brass connections rather than plastic, sealed bezels to prevent moisture intrusion, and warranties of at least one year. Many drivers actually prefer aftermarket options for their improved visibility, LED backlighting options, and more precise readings compared to older OEM units.

My dash lights work but my gauges don't read correctly - is this a gauge problem or something else?

Before replacing gauges, check these common issues: corroded ground connections behind the dash, faulty sending units (especially for temperature and oil pressure), blown fuses in the gauge circuit, or damaged wiring harnesses at connection points. A non-functioning gauge with working backlights often indicates a sending unit or wiring issue rather than a faulty gauge itself. Test with a multimeter at the gauge connections to determine if you're getting proper signal voltage.