In a message dated 9/27/2010 2:43:16 A.M. Pacific Daylight Time, paulsiano at yahoo.com writes: Tachs are calibrated for6 cyl Think how you can impress your friends! It is like setting the new cars to Metric readouts - 200 on the Speedometer? No problem! Seth Emerson C's the Day! - Corvair, Camaro, Corvette San Jose, CA