Re: Volts and temp gauge engine connection in the engine compartment
You will have a hard time tying into the purple wire at the engine. This uses the modular wiring system, all Deutsch plugs, and no way to attach to the purple wire. You would have to cut your harness to splice in, and I would not do that.
The purple wire does run up to the controls, and tach, etc, so I would hook your volt gauge with that end of the purple wire. As said above, you will need to buy a gauge and proper sender for the temp function. The sender will attach to the head and you will need to run a new wire to the gauge. If you already have a gauge, look on either head for a sender that may still be there. It will only have one wire connection, and might be bolted under a head bolt, or it might be in a threaded hole that is provided as a convenience for people adding the temp gauges.