Just bought this buggy, its an 83 chassis with an 87 engine with efi and I'm trying to clean up the wiring. The O2 sensor wasnt connected so I dont know where to run the wire for the new one I just installed (single wire) . The problem is the po left both the 83 and the 87 wire harnesses so I removed the 83 and have been trying to eliminate all the extra wires I can. Its a bit of a mess but Im getting there. Right now I just need to figure where to run the alt wires and connect the O2

 

Now I have figured out that this is more of a Heinz 57 than I first thought. The alternator is from an older model with the external voltage regulator, the wiring harness is from a 94 so I need to know what wire I need to run the single wire sensor to from the 4 wire plug. And what wires go where on the voltage regulator and the alternator. Thanks ahead of time for Any help I'm about to pull what hair I have left out.