Hello, recently bought a psi tuning box 2nd hand with no instructions, i know where the two plugs go 1 into the engine and 1 into the wire you took out of the engine. i know the two wires that go to the postive and negative on the battery but where does the spare black wire go i have on the connector that plugs into the actual psi box? If that makes sense? I was thinking perhaps fueling or throttle sensor but not sure at all so any help is appreciated

I can post pictures if that helps but thought i would ask first TIA

Why dont you give Andy or Pete a call at PSI? They will be able to tell you.

Cheers for the reply Huxley, will do.