Where To Tap Rpm Signal?

[LightningGSX]

I suppose you could hook it to the tachometer wire also, but depending on the input impedance of your wideband commander, it may not work.And I suppose if you can adjust the RPM input on the commander, you could just hook it to one of the coil trigger wires on the power transistor, but since we have waste spark setups, that will only be half the RPM signal, so unless you can set the commander for 2 cylinders it won't work..