Recently bought my first tractor ever, 1962 JD 2010. I've read all the bad mojo surrounding these tractors, but hey this one works just fine. My issue is the water temp gauge and the tachometer don't work like they're supposed to. The water temp gauge just stays cold all the time. The tachometer just bounces around near max RPM no matter the engine speed. I have no history with tractors so I'm a newbie. Looking for any quick troubleshooting pointers. Is this a common issue on older tractors?