Here is a little update on the TNC Tachometer.
I LOVE IT.
It does exactly what I wanted it to do. It reads the engine rpm accurately and steady with my hand at least 1' or greater from the prop. The tach reads the rpm in hazy, overcast, low light conditions.
The other day I was testing an engine at home almost dark. I thought I would try the tach. The others that I have ever used would not read anything in this low light. The tach worked perfectly.
Now all of my friends borrow it to check their engine rpm. One friend call me a few days ago (a very clowdy dark day) and asked if he could bring his plane over and check his engine rpm because his tach was not working reliable in the low light.

Again I say this is a Great tach.

I have included a photo of the tach from the side showing the push button from from the side.

Lee