i'v had this rev counter in an frst engined ka for a while now, but because its a 4 cylinder rev counter rather than 2 cylinder, i need to use both feed wires from the coilpack, if i just use the 1 then the rev counter only reads half what it should, but if i use the 2 wires then the rev counter reads right but its basically bridging the 2 wires and doesnt run right as if its firing on all 4 cylinders all the time.

i'v been told that there is some sort of diode you can get to stop it feeding back? is this right? if so what do i need?

any help much apprechiated.