I have a 2005 Four winns and my temperature gauge was reading a little hot and my risers were cold so I changed out the gauge to a brand new one and then the new gauge started jumping around erratically so I called the company and they sent me a new gauge and the same thing is happening. I am plugged with wires going into the thermostat and I didn’t make a difference at the gauge. Nuts and wires are all tight on the back of the gauge so I was wondering if anybody could shed some light on this