Are you talking about the tach wire? You don't really need that for PP unless you want the RPM control, which sucks for wakeboarding. PP's control happens straight from the paddle wheel speedo which connects directly to the brain box. I didn't hook my tach up for a long time, but finally did so that I could tell PP that it worked properly on Toyotas, I was the guinea pig
Even on my oddball boat, the wire with the tach signal was the grey wire in the harness coming from the engine. It is an industry standard thing. You don't need it to rock and roll but look at the back of your tach, one wire is grey, hook it up there. Or follow the engine harness up from the engine compartment and hook the vampire connector to the grey wire. PP is the best thing ever.