ORIGINAL: Gray Beard
Not quite Don, I have three other tachs you can point at the light and get a perfect reading, point them at a prop with any background and they can't read it. I gave up on the cheap tachs and bought the TNC, it works under any light conditions you would fly in. These new little tachs wired into the ignition are slick. Like all tachs, not often really needed but I have a couple of engines that are way easier to tune with a tach.
Gene, I've had a couple of those tachs also. The one I have had the best service out of is a Magnum tach. I've had two, the first met it's end when one of the Helicopter guys borrowed it and got to close to the main rotor. I found a replacement when the LHSwent under. The others wouldn't give you a good reading at all.
Who handles the ones that tie into the ignition? I would like to get a look at them.
Don