Need help identifying bad IVR

Awesome, thank you all for the responses! 67Dart273, thank you for the picture of the resistance test, I will try that after I test the temp sending unit. I'll start by testing all the sending units as soon as I get the chance and report back here.

And I do plan on pulling the cluster soon-ish to install a tach and replace the bulbs, so when that happens I will go ahead and replace the IVR regardless if it's good or not. Thanks again! I'll keep everyone updated as I make progress