EURO BLK 6000 TACH I/O

Features 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.; 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.; Wide range of scales.; Multiple signal sources.; Rugged, Reliable construction.; Size - 4 in. - Hole size - 3.375 in. (85 mm.).; Item Weight - 0.70 lbs.;.