I just bought a G-tech Pro RR, couldn't get the rpm to be accurate. I tried a few calibration already, used 4500rpm and 2000rpm as the cal points, and chose 4 as the # of cyclinders. I found calibrating with the head light on gave better result, but the reading is still 100-150 rpm off.

Anyone happy with the rpm calibration?

 

I have found that the reading on my tach is off by about 100-150 RPM (when compared to the digital readout on my SAFC). What are you using to determine your "accurate" RPM?

-Paul

 

I compare it to an accurate Defi VSD2 meter.

 

anyone else please?