Thanks for the info. My manual is older and doesn't seem to have that info.
The actual gauge in my aircraft is a C669512-0102 and the sender didn't appear to have any useful P/Ns on it. Although, I was just looking at the Aircraft Spruce site and they sell a non certified one P/N 3080-37; my sender does have 3080 stamped on it but with a 55 under it? I'm guessing someone put the wrong sender in for this particular gauge. The aircraft is relatively new to me. I noticed it was high on the test flight but pressure looked good so figured it was just a gauge error.
I did test the sender on the stove in veg oil with a Fluke meter temp probe as the ref and it seemed to be down in the high 20's at 250. I saw the 34 ohm spec somewhere else on this forum as well. I think my problem is going to be getting the correct sender for this gauge.
