1985 K1500 305 Thermostat Housing Temperature Switch

[Waylon]

Hello!
I have a 1985 K1500 with a 305,700R4 and AC.
I’m trying to get a part number for the temperature switch that screws into the thermostat housing/water neck. It has one prong. There are two ports in the housing and I have the part number for the thermal/vacuum switch but not the other. Does anyone know the part number for this?

 

[Old Guy Bill]

Is this the temp sending unit?
If so you could possibly find one here..

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[Ricko1966]

Is this a California truck? Is there a TPS connection at the drivers side front of the carb. I'm used to seeing that switch as a 2 prong to control the Dual Capacity accelerator pump. I'm wondering if you have a CCC carb if that's the case it will be easier to find that switch for a GM passenger,way more common for CCC carb. Trucks were rare with it.

 

[Waylon]

No TPS on it. This truck was bought new in Texas. I thought I had a picture of the emissions label on my phone but I don't.
Please ignore the huge dirt dobber nest on the carb. These pics were taken as I was about to pull the carb and rebuild it.
The connector goes to the dual capacity pump. It's a black wire with a green stripe. The pinkish looking wire at the pump connector isn't connected to anything.
I haven't bothered with researching where it goes yet.