1998 Coolant Sender (not Sensor) to Gauge - not working?

[wtdash]

1998 Forester, 267K miles.

This part: 

-Edit: 12/3/23. It's the spade connector at the gauge. I pushed it (not sure it actually moved) and the gauge started to work. Weird as I'd done that before and no change at the gauge. 

About a month ago, It stop working consistently. Go up to the normal -just below half setting- and then drops all the way down. And this last week nothing - doesn't budge. 

I've tried two other senders - one used and one new - and they both worked initially, but then nothing the next day I checked it. 

I've visually checked the wiring which appears fine.

• Does the dash cluster gauge ever fail? I've never come across this issue and only pulled one cluster on a '96 Legacy, so not sure if the gauge section is even accessible?
• Maybe a solder joint has gotten weak, etc?

Thanks

Edited December 4, 2023 by wtdash

[lmdew]

I forget if you ground it I think it goes full hot.  You can check the resistance and see what it does with increase of temperature.