I have a powermaster and I love it. The 1-wire hook up is as easy as it gets - no modifications needed and the wiring is all included. However, it does need to hit a specific RPM before it "kicks" on, BUT when you start your engine, the RPM's go up a little anyways and that's usually enough to get it started. It's not like after you've been driving a bit and come to a stop light, you have to keep it at a certain RPM to keep it going. Once it's on, it stays on until you shut off the engine.