I think it is somewhere on the block in this pic.
Ignore the pic of the oil pressure sender at the bottom.

 

There are two of them. The one for the dash gauge is very small, above the oil pressure sender in the rear end housing.

The other is on the back of the water pump, & runs to the ECU. This is the one the Power FC Commander displays.

 

is the one behind the housing important if you don't have a Power Fc? there are none of these on the japenese cars

 

The one behind the housing sends the water temp to the stock ECU in American FD's.

 

Ah ok. Thanks!