Timing light and Tachometer

[TopCatGr58]

Hey Tod,

The aftermarket digital tachs will be looking for 1 spark for 2 revs, a conventional automotive setup, but we have 2 sparks for 2 revs, so the tach would be counting 1 to many revs, so that's why you need to divide by 2 to get the TRUE rpms per the tach readout. You are right in how YOU are counting the rpms and sparks, but the tach would not be! Get it, got it, good!
T.C.

[LoserShoes]

The tach has a X 2 built in to it to read correctly with 1 spark per two revs. Give it 1 spark per each rev and it reads 2 x the actual revs. So divide by 2.

Steve

[tony7914]

The timing light I bought has a feature built into it for 2 cycle and 4 cycle for the digital tach, the instructions say to use the 2 cycle setting for wasted spark distributer-less systems. It worked very well for me.
Thanks again folks!

[LoserShoes]

Yea, that works too.

Steve