Temp Gauge

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Apr 7, 2009
low desert of So Cal
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.
Did it work correclty prior to the engine swap?

Tried the old sending unit?

Yes it did, always registered correctly. I just took the sending unit and extension/riser out of the old F head and installed on the 2F. the F unit is quite a bit longer than the 2F, we'll see what happens in the morning when I heat it up. I put a new thermostat in it so I need to wait for the sealant to dry.

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