TB42 E gurus? Which wire is -neg from the coil?

[no eye deer]

Buggered if I can figure it out. I've had a look at the manual, but (as far as I can tell) it doesnt show it. I want to wire my LPG tachometric relay (safety switch) from the coil, instead of using a couple wraps around the HT lead. I'm chasing a stumble on accelereation, is all.

Thanks fellas
Mark

[liftlid]

The coil should have a + and- on it. But the + will have 12v on it with the ign on ( short time only) . Meter to the body.

[no eye deer]

Thanks Liftlid. My coil only has 2 wires coming out of it. Doesnt have the normal coil pos and neg posts.

[Fox7]

As i know efi coil wiring is different than normal carby coil with contact breakers. mine is carby.