Making very slow but steady progress on my build. I enjoy going to the garage and learning something new each time.

Was going to splice my "purple tach wire" from the sending unit harness last night, but don't have a purple tach wire in the RF sending unit extension. According the the RF schematic, all the other wires I expect to see in this extension are there but the purple wire appears to have been replaced with a black ground wire. Anyone else experience this? Did RF just put the wrong color in this extension? Last thing I want to do is cut and solder the wrong wire to the coil wire. I do see the purple wire it in the dash and guage wires, but disappears somewhere before it gets to the sending wire harness.

Thanks.