p strong 4 Heavy-Duty Tachometer 4000 RPM Diesel Mag Pick-Up - Black with Black Bezel strong p p strong Hole Size strong 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 p strong Features strong p ul li Wide range of scales li li Available for gas or diesel engines li li Multiple signal sources li li Anti-scratch glass lens li li Plastic Cases for corrosion resistance and long life li li Black with Black Bezel li ul --- cis2 mmxtmJVt --- br
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