Griz
I'm not familiar with your particular tach. so what I'm about to say may, or may not help.I installed an electronic tach from N. Tools a couple years ago. Fortunately, mine has been working fine, sorry to hear about your misfortune. Attaching the sense wire to the coil wire does not improve accuracy. Those meters are built to work on a 1 piston fire senario, and you program the number of engine revs per fire, so it will work on about any engine, regardless the # of cylinders. By hooking-up to the coil wire, your getting 4 times too many input signals to the tach. I think you need to connect your sense wire to a plug wire. I can't recall now how many revs correspond to one fire, maybe 2 or 4 revs. Either way, you will know when you have it right when programming it because it is easy to tell if your engine is running at ~400 RPM, ~800 RPM, or ~200 RPM. at idle. I wrapped some black electrical tape around the sense wire on the plug wire. It matched the plug wire so it looks nice, and keeps the sense wire tight against the plug wire so I get consistent readings. The instructions on mine also called for a specific number of loops around the plug wire when wrapping the sense wire. Don't know if yours is the same or different. Hope this helps
George
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