I took my grady out last week and found a major oil pan leak so I am yanking the motor, but I also had a problem with the gauges. They after a minute or two they would all jump. For example the gas gauge would read 1/4 tank then drop to empty, the back to 1/4 of a tank and the temp would go from 150 up to 190 then back to 150. same with the oil pressure (wasnt' really watching the volt meter). What the heck can cause this type of problem? and what would be the best way to fix it so I can monitor my temp and oil pressure reliably?