Where does the factory water temp pickup?

[Sidewinded_idi]

on the drivers side head there are two ports. The closest to the firewall I plugged. And the front one is used for my gauge. On the passenger head there's nothing in it yet my cold idle still works and my factory dash gauge, in just curious where this mystery sender is located

 

[chris142]

The one for the fast idle and timing is on the other head.

 

[chillman88]

on the drivers side head there are two ports. The closest to the firewall I plugged. And the front one is used for my gauge. On the passenger head there's nothing in it yet my cold idle still works and my factory dash gauge, in just curious where this mystery sender is located

Looking for the temp switch for the high idle and cold start?

From the front of the truck look down to the right (Driver's side) of the radiator hose. It's tucked down in there, kinda behind the IP housing between the IP and the radiator hose below the high idle solenoid. It's just a thermal switch that is closed until temp is reached and then opens. Not really a "temp sender" per se.

 

[FORDF250HDXLT]