Who could possibly figure out all the mismatch wiring and any other problems on a 59 Chevy to a 83 Jeep?? So many questions to ask like What motor does it have? Jeep, Chevy, Poopmobile? Old senders don't work with modern gauges. Old Gauges don't work with modern senders. Does it run? and drive?, brakes work? Your grammar does not bother me, it's the fact that you actually bought this "truck". ***Rip out all wire and start over. Forget what two vehicles it is and just wire it generically. Dash stuff: Battery to Ignition switch, ignition switch to fuses, thru fuses to switches, thru switches to component and ground components case or it's ground wire to chassis.
Gauges: sender to gauge. Pos terminal on gauge to fuse.(depending on type of gauge)
Lights: battery to light switch (thru some sort of fuse), light switch to lights.
Ignition: "ON" to fuse panel(already said that) and to coil. "START" to starter. You don't have to use the existing connectors or harness routing or wires or fuse panel. Only if convenient. Wire direct when possible and use any connector that you can splice into the new system, just to have serviceability of some circuit or other.
***If something works, wire it last to see if it can be left alone.
Don't quote me on this. But if you don't know anything, this is an overview. Yes 59 is 12V.
