Many TMs have a RecPro kib M21 monitor panel, or one from that family. If this is yours, a quick Google search shows that you can find a copy of the manual and wiring diagram here
https://www.dutchmen.com/resources/m...nformation.pdf
This shows the orange, green, yellow, and red wires connected together, with the first three going to the tank probes, and the red going to the panel. Or the red wire may become gray at some point - it is not clear. The white wire is ground.
Bill