This would be no different than a properly made home-made diode circuit.
Could you describe your problems? Does it always read low RPMs? If not, does it read exactly 1/2 RPMs when it's exhibiting the problem?
Tachometer Adapter board
Moderators: JeffC, rdoherty, stieg, brentp
We're not familiar with that circuit design- it's different than what we have, but it seems that it could work. You might want to check connections on the diodes - if all connections are good it's possible one of the diodes might need replacing. Replace both just to be sure.
Make sure you're using diodes rated for at least 400V - like a 1N4004 or equivalent.
Make sure you're using diodes rated for at least 400V - like a 1N4004 or equivalent.
Wiring
Good morning, before attacking my wiring loom, wanted to check where to place the circuitboard i just recieved. Im running a v6 with wasted spark and an after market ecu - Vi-PEC (the same as link). My tacho is a standard Ford one and expecting the 400v, but the aftermarket ecu only puts out 12v.
Understanding the circuit board needs the 3 pulses, but does it need the 3 pulses from the ecu (low voltage) or the 3 pulses after the ignition amplifier that go direct to the coils?
Many thanks
Understanding the circuit board needs the 3 pulses, but does it need the 3 pulses from the ecu (low voltage) or the 3 pulses after the ignition amplifier that go direct to the coils?
Many thanks