http://www.autometer.com/hp/instruction_do...uctions/561.pdf
Seems to me that this wiring diagram shows the same thing we have, only with 2 trigger wires, for whatever reason. The main point that I see, however, is that the adapter senses the ignition pulse over the positive wire and converts it into a 12v signal that is usable for a tach.
Check out the diagram and let me know if you think this would work. The other question, maybe for kdxboy or another resident EE, is if this device might put some sort of draw on the ECU that could fry it. I don't think it would, since it is installed on the 12V supply side.
All we need to figure out now is the answer to another question - does the plug fire every time the piston cycles, i.e. 2 times per "revolution", or just once? The Autometer cycle tachs can be set up for 1 pulse or 2 per revolution - I assume this is what it is talking about, right?
What do you think? I'm excited, as I think this might work.... Who wants to be the test dummy? If someone has a spare ECU I can use, I will try it.
![biggrin.gif](http://www.cannondaleriders.com/forums/style_emoticons/<#EMO_DIR#>/biggrin.gif)
Marc