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<p><strong>Chesapeake White SS 4" Tachometer with Hourmeter (4000 RPM) (Diesel) Mech. Takeoff &amp; Var. Ratio Alt</strong></p><p>Perimeter-lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens.&nbsp;</p><p>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 above.</p><p>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.</p><p>4" - Hole size: 3.375" (85mm)</p><p><strong>Specifications:</strong></p><ul><li>Anti-scratch glass lens</li><li>Plastic Cases for corrosion resistance and long life</li><li>12 VDC negative ground</li><li>Can be adapted for 24 VDC systems</li><li>Scale - 0 to 10000 Hours</li></ul><p>Factory P/N TD9108</p><p>*Sold as an Individual</p><p>**Gauge Cover not Included</p> <!--- cis2:m2hqmpZo --->