p strong 4 Tachometer 4000 RPM J1939 Compatible without Pressure Port - Euro Black with Stainless Steel Bezel strong p p strong Hole Size strong nbsp 4 gauge 3 375 85mm mounting hole p p Perimeter-lighted black dial with bold white graphics black aluminum SAE style bezel contoured white pointer and flat glass lens p p Electronic tachometers work by counting pulses generated by the ingition system alternator tach signal generator or magnetic pickup sender The tach is hooked up to 12vDC Ground and one of hte signal sources listed above p p By selecting the right tach and setting the switch on the back to the correct postion you let the tachometer know how many pulses are sent per each engine revolution p --- cis2 mmxtmJVt --- br
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