I think it's a bad idea to try to rewrite or paraphrase the Phak Tech Tip. It's good and been tripple checked. We should just link to it or advise to go to Tech Tips.

Note to Wade:
1. The sending units are not voltage specific.
2. I know you know this but you used the term "hot wire"....that always means a wire that has voltage. Which you never ground to chassis.
3. Follow the Tech Tip and post any questions about it or your results.
4. Use the sender Jon G recommends if results show you need a new one.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn