I went out this morning too change the sensor and found there where two sensors by the thermostat. Both have 2 wires coming out of each. Looks very similar, not sure which to change? Anyone know which of the two is the ECT Sensor? I can't find any pictures on here or on the net anywhere to help. Thanks in advance!

Bucket.

 

Forgot too mention it's a 1998 4.6L romeo engine.

 

the temp gauge sender is on the front of the manifold, whereas the EEC sender is a dry hole and uses cylinder head temp. Front, interior cylinder head, driver side. CHT is used because of the trucks "fail safe" cooling system.