If your tachometer seems to have a bouncing needle, only seems to work in a small range, or floats on acceleration, a Tachometer Filter just may solve the problem.
What the Tachometer circuit board does: The tachometer circuit board counts pulses. If those pulses coming from the ignition system are too noisy, noisy meaning high voltage spikes and extra signals, the circuit board will see more, less, or uneven pulses.
What a Tachometer Signal Filter does: The filter filters out high frequencies and send then to ground. Low frequencies pass through to the tachometer circuit board.
How will a Tachometer Signal Filter affect your ignition system: It will not affect your ignition system. It is a passive device that simply filter the out going signal to the tachometer.
How will a Tachometer Signal Filter affect your tachometer: It will protect it from high voltage spikes that could reduce the life of your tachometer.
How can you get a hold of a Tachometer Signal Filter? We have a low cost Tachometer Signal Filter available