My temperature gauge in my 56 customline has never worked. So i put in a new sending unit and it still never moved even when i grounded it.took out the gauge and saw an adjustment on it so after the adjustment it now works but it works backwards. Key off needle on cold. Key on goes to hot. After engine warms up it slowly goes to normal.i have swapped the 2 wires back and forth and it doesnt make any differance. The new sending unit i think is from china and im wondering if it could be the problem. Anybody else have this problem?