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So the dome light I just branch out via the stop switch circuit prior to the actual brake switch? Then from that triple split I would run it to the headlight switch and back to the dome light since I don't have door jamb switches?
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to be clear your dome light has 2 wires that hook to the headlight switch
the orange wire on the pic gets power from the brake light circuit which also feeds your dome light
your dome light has 2 wires: 12v+ and a ground wire: the 12v+ comes directly from the orange wire
to turn on the dome light you need to ground the dome light, either thru the headlight switch or the door switches
the pic from post #5 shows the white dome/courtesy
ground
this is where you hook the ground wire for the dome light to turn it on
the reason the dome light uses a grounded switch is that
any ground can turn it on
whether that ground is the headlight circuit or door pins it does not matter
while your pickup only has one switch, the 4 door cars of that era had the headlight switch and 4 door pins
any door pin also goes to ground
your brake circuit is currently feeding the side marker lights, dome light, the reverse lights and (obviously) your brake lights
this is the same as the original brake circuit