924 temp gauge problem
 

I have a 77 1/2 924 and the temp gauge flutters when at idle. It also seems to run about 1 notch hotter than normal on the gauge. I recently replaced the engine and it ran fine for 3 months and a couple weeks ago it started running a little hot. I've check/cleaned all the grounds and elect connections everywhere and burped the coolant but the problem is still there, any ideas?

Same problem for me. :(