Hey guys. We have a set of Stewart Warner gauges in our 39. Every time I turn the key on the gauges go on, the temp goes to 180, oil to 40 and the gas goes to 7/8th. This is without the motor running, cold and 1/4 tank of gas. Dissconnected the senders, all stay at 0, ground the senders all go to full just like I expected. Checked the ground to the gauge cluster. I'm lost. If it was only one gauge I'd say it was a bad sender but all 3? Suggestions?