[quote=catamount;992719]In that case I would go to my junk drawer of old cell phone chargers until I found one that was between 3 and 6 volts. Cut the leads off, hook to the correct posts and see what happens. Just make sure the output on the power adapter says DC of course.
Hmmm. This sounds a bit risky. I don't want to be the test monkey with a new tach. Anyone with an old tach they want to try this on?