I like your warning lights. Idiot lights are better to have than just a gauge. When I went to the NASCAR driving school with Seat Time Racing they wanted us to check oil gauge each lap. LOL they had a huge red light in center right in front of you if you lost oil pressure it came on. You did not have time to look at the gauge. Same when driving in traffic or curves like we have here. The gauges being in the center does not help either. Would be interested in how you hooked them up. I am not any good with car electric things, lol.
David, the answers to "how they were hooked up," are in this thread. Senders sense temperature and pressure and at specific temp and pressure they close the electrical circuit, energizing the warning light. In this case the sender opens and closes the ground side of those two warning light circuits.