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<p><strong>Chesapeake Black 4" Tachometer - 4000 RPM (Diesel) &nbsp;(Mechanical Takeoff &amp; Var Ratio Alt)</strong></p><p>Perimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured white pointer and domed glass lens.</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>Perimeter lighted back light</li><li>12 VDC negative ground</li><li>Can be adapted for 24 VDC systems</li></ul><p>Factory P/N TD9127</p><p>*Sold as an Individual</p><p>**Gauge Cover not Included</p> <!--- cis2:m2hqmpZo --->