Hey Juice,
Four years ago the "Thunder Tiger Digital" tach. was recommended to me and hasn't let me down yet. They are listed at
www.greathobbies.com for $56 cdn. Part # is TTT2642.
Take all your tach readings from BEHIND the prop. This tach. works in all kinds of natural light. I've seen here a number of fellows can't get a reading from behind the prop only in the front? If your not getting a reading from the left side of the engine, try the right! If you still do not get a reading, turn the plane 90 deg. or even 180.
This is a good tach for the $$. I know some guys at our field were having problems with the "Globee" and that might be one to stay away from.
Happy Fly'n....