View Full Version : any other way of RPM measurements?

07-09-2008, 12:10 AM
Anyone know how you check RPM secondary to the tach, or test the tach of calibration?

07-09-2008, 12:21 AM
Use a different tach or if you will be doing other tune-ups and have points, MCM sells a multi-meter that does Tach and dwell for about $20.

07-09-2008, 11:18 AM
Perfect pass shows RPM. I thought I was running too high a pitch prop until I installed perfect pass and it winds up my tach is 400 rpm low.

07-09-2008, 03:59 PM
is your tach set up for 8 cylinders ?? there is a screw setting at the back of the tach for 4, 6, and 8 cylinder settings ifits at the wrong one it will give a bad read ...