Humminbird HTG-1 temperature gauge

Out of my (year) 2001 Ski Nautique.

The air temp worked when I pulled it, the water temp did not (showed like 21F when the water was closer to 40F). I assume it is probably the sender but cannot confirm for sure.

Make me an offer, just trying to help out a fellow Nautique owner, not looking to get rich off it. FYI: I am pretty good at finding obsolete stuff, and I couldn't find a replacement sender, so assume yours would need to work...