Well, finally had a few spare minutes to readjust the pitch on my prop.
Started up and tried to get a static RPM but unfortunately my tach was bouncing all over the place. It finally settled down a bit but still varied by 200-400 rpm. It does seem to stabilize a bit at higher RPM's. Bad Tach?

Oh, I should probably mention that my voltage regulator/rectifier was bad also. Everything went crazy for a second and then my low voltage light came on. I shut it down and replaced the rectifier before restarting.

Anyone ever had this issue?

Didn't have time to diagnose it but I am guessing the tach is bad. It is a VDO electronic type. Haven't had anytime to fly yet this summer and it will be fall soon.