So, I just put a '79 2F motor into my '69 FJ40 and I notice that the temp gauge is kinda working backwards. Could it just be the sending unit? Anyone ever hear of this? I did not mess with the gauges at all. There is a different type of connector on the units, '69 has the "mushroom" looking type while the '79 is a typical spade type. Also, the chassis and body are both grounded.