8G "Single Pin" Coolant GAUGE Sender location/Part #?

Hi all.

I picked up an 8G a little over a month ago. It's got it's problems and I've got it's fixes. Except for the fact that even on a cold start, the gauge reads pretty much in the middle. When the car gets up to temp, it's still in the middle. When it starts to get a little warm (Jump off the freeway and park with AC on, etc), it'll go up just a teeny tiny bit.

The *ECU* coolant sensor is perfectly fine. Verified in Torque Pro (and using while DDing so if it does get too high Torque Pro will alert me).

The gauge needle is working just fine, as it does drop all the way down when shutting off. I'm 99% sure that sender is just bad. My coolant is also pretty rustic orange-powdery. Previous owner probably ran filtered water. Iron Block = no go lol. Going to rinse that all out here this coming week.

TLDR Does anyone know the part number and location on the engine of the 4G64's single-pin coolant GAUGE temperature sensor? I know where the rad and ECU one are. Thanks m8s.