Well,was thrift shopping and i picked this up. Its a actron cp7605

It measures dwell/tach/volts/points. Im guessing this is for oldschool applications. It has a 2 wires with a clip lead on each one.


pretty sure on how to use the voltage,ground clip to ground,other lead to positive.

for rpm,Would one go to ground and one go to the nut on the tach side of the coil? How could i use this on a newer style ignition coil without tapping the wire?

Not sure how to use dwell,im sure its something to do with timing advancing.

No clue on the "points". It just has a small bar,about 1/4" long and the word "ok" on half of the bar.


edit : just played with a 9 volt battery. green lead is apparently positive. black leads ground. cool,volt part works.

 

actron.com/publish/2007/05/18/pdf_english_16160.pdf

 

yeaaaaa i already found that. Dwell/points is useless to me until i find something old to work on.

 

Man, old school! Every now and then I'll blow the dust off the ol' dwell meter and tune up my '73. Anything newer than that has electronic ignition.

I've seen my dad set points by eyeballing them. When I got home and checked it with the dwell meter, he was only a couple degrees off!

 

Dwell is only used on points ignitions. The wider the gap, the smaller the dwell on the points. GM back in the 60's and really early 70's had a little door in the side of the distributor cap. Adjust the points with an allen wrench and watch the dwell. When it reads right, the gap is right.

 

Or, use that flexy screwdriver with the allen head on the end of it!! Much easier than an regular allen wrench!!

 

Oh well. at least the volt function works on mine. Maybe i'll sell it. or keep it and play with stuff. I used it to check voltage on some 9volt batteries. lol