Like MikeP996, my engine temp gauges don't agree with each other. I have been diligently watching by helm gauges and pulling back if temps get to 190, but I once went down to the engine rooms to check and when the helm gauge read 185 at 2000 RPM cruise speed, the port engine room gauge read almost 200 degrees! The engine room gauges are the original type aguge with a copper line running from the manifold to the gauge. The helm station has electrical gauges. What do others do for gauges?