Thanks for the suggestion. Here's the latest, with the car running I swap in the old cluster and no gas gauge reading but temperature is fine. Then I swap back in the new cluster and gas gauge reads correctly but no temperature. Grrr. No visible breaks in the ribbon and the temp and fuel gauge look like a paired unit so unless I really dig into the thing, separating them would be tricky. I can live without a gas gauge (I get about 300 miles per tank so I just set the trip odometer) but temperature is my most important gauge so might be going back to the old cluster. Thanks for everyone's help here, much appreciated.
Friday, April 16th, 2021 AT 8:28 AM