I just finished my first conversion and got it up and running this week end. It's a Homelite style engine from a Craftsman weedeater.
I also bought a tach from the LHS since I lost or broke my old one a few years ago. Can't remember what happend to it.

Anyway, photos of both the engine and tach below.

The tach just gives random readings all the time regardless if I'm inside or outside. The guy at the LHS said it was what most
are buying. Yeah, right. My old tach was just a small black box with readout and on/off switch but rarley gave false readings.
When it did it was because I was real close to a floresent light. I used to build my own brushless motors.

I'm also wondering if the ignition of the motor is causing so much static that it's interfering with the tach. I'm running a Champion
DJ7Y plug in it now and I don't think it's a resistor plug. I do have a Bosch RO 285 plug, is that a resistor plug? I've read that the
plug # is supposed to have an R in the # if it's a resistor plug.

I'm leaning more twords the tach as being the problem but I don't want to rule out the ignition tho.

If you guys have any ideas on this I'd like to hear them.

John