Alright, I've looked everywhere trying to find which senders I need for these crappy Dolphin gauges we have. Unfortunately I'm going to have to make due with them since they're already there and the budget doesn't allow for new gauges. Not for the foreseeable future anyway. I emailed their tech support and the only response I got was that I have to use their senders. Supposedly proprietary. At $15 each for the oil and water temp the price is fine. I just haven't read a lot of positives on the quality. I don't mind dropping a few more bucks for senders that are accurate and wire terminals that don't break off. Okay, shake it off.