1985 VF700F Interceptor Tachometer and Temp Gauge Issues

I'm having some weird issues with the tachometer and temp gauge on my Interceptor. My tachometer will sometimes get stuck between 3000 and 2000 when coming to a stop, but the engine is definitely staying at 1200 rpm at idle. If I tap on the plastic lens, sometimes I can get the needle to drop down the proper reading. When I accelerate from the stop, it will start from where it was stuck giving me false readings. Another issue it has is when I accelerate hard, the tach will get hung up around 6000 and all of a sudden jump up around 8500 rpm or just stay at 6000 until I slow back down. The issue with the temp gauge is that anything over 3000 rpm, the temp gauge will drop down to almost touching the pin, but if I pull up to a stop or drop the throttle and pull in the clutch, the needle jumps up to the proper reading. I have pulled the cluster apart to try and see if there was anything obvious like dirt in the tach or a corroded ground but everything seemed to be quite clean and tidy. Could this be a bad battery/regulator, or are my gauges just starting to fail?

 

sounds like the tach part of your cluster is going bad the temperature gauge seems to be working fine it would be a cooler reading when engine is at a higher rpm crusing down the road and fan working it would be warmer idleing at a stop sign if fan wasnt on