i ran the power off the yellow wire from the headlight switch. I tried several different ways to run the rpm wire, best luck i had was just takping it down on the sparkplug wire, i didnt wrap it, just ran it parallel with the wire maybe like 3 inches. My rpm read out seems pretty accurate, i just needed to switch the plugs to the BR8ES rather than B8ES. When running B8ES the computer would restart when i hit high r's. All in all i like the computer, the main feature that made me buy it was the temp readout and warning lights.