Previous post is more than you need.
Red - Alternator D+
Black - Oil pressure switch
Yellow - Temp gauge sensor
Blue/Yellow - Starter solenoid #50
Do the "destination" ends first. Try to get same-color wire, 16gauge. Except for oil pressure sensor, the wires use female spade lug connectors.
Do the red and black first. Route all the way to the firewall connector, leave some slack.
The other two, yellow and blue/yellow, run under the intake manifold. Put some protection on them.
On the starter it's important that (1) the battery is disconnected, and (2) remove ONLY after noting which terminal is goes to. There are two spades down there.
After you get the four ends up near the gray connector, then you can work that end, just like other posts said. Be sure to note what wire goes into what pigeon-hole. The metal clip can come off the firewall, and the connector has little hinges to allow opening up the side so as to remove the weird little connectors in there.
It's sort of a long many-pieces job, but a good DIY when you compare to the non-DIY costs. If other wires in the main harness are going bad, this fix won't cure them. However, this fix will prevent many many problems,
Good Luck,
Bob
:>)
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