Faria Euro White 4" Tachometer 4000 RPM (Diesel) (Mechanical Takeoff & Var Ratio Alt)

Euro White 4" Tachometer 4000 RPM (Diesel) (Mechanical Takeoff & Var Ratio Alt)Perimeter-lighted White dial with bold Black graphics, Black aluminum bezel, contoured White pointer and flat glass lens.Electronic tachometers work by counting pulses generated by the ignition system, alternator, tach signal generator, or magnetic pickup sender. The tach is hooked up to +12VDC, Ground and one of the signal sources listed.By selecting the right tach and setting the switch on the back to the correct position you let the tachometer know how many pulses are sent per each engine revolution.4" - Hole Size: 3.375" (85mm)Specifications:Anti-scratch glass lensPlastic Cases for corrosion resistance and long lifePerimeter-lighted Black dialCan be adapted for 24 VDC systemsFactory P/N TD9123*Sold as an Individual**Gauge Cover not Included