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Tachometer Wiring Ideas

13132 Views 6 Replies 4 Participants Last post by  Mr. Sharkey
Continued from the EV Calculations Thread

KiwiEV, the 1.5 volts that you're supplying to the tach isn't really what the gauge needs. It is just a coincidence that 1.5 volts moved the tach to 4,000 rpm. A conventional 4 stroke piston engine will send a signal (a 12 volt signal IIRC) to the tach one time for every 2 rotations of the crank. I have heard of people placing inductive pick-ups on the front shaft of a Warp8 or similar double shaft motor, but that would send a signal to the tach twice as often as needed. I guess it depends on the car as to whether or not the tach would like that signal. How is it possible to divide the number of pulses by two?
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