Question on wiring my VFRness and R1 Mosfet R/R

The 3 yellow cables are from the stator and go with the 3 pins of the R/R. I got the Eastern Beaver connectors so I am ok there. Question is the power side. I get the Red and Green but the VFR and the VFRness also has a Blue wire. Is the blue wire another ground?

 

Ignore that wire. The R1 rectifier doesn't use it.

 

I believe that is the sense wire on mine it's black.
It sees ground when the key is off and direct battery + when the key is on.
I hooked a 1amp fuse, and a voltage meter (also has clock and temp) to it. Works great because it allows the voltage meter to essentially be on its own circuit. Since it doesn't share a circuit with any accessories, it shows an accurate reading of battery/ charging voltage regardless of any accessories being on or off.
If your volt meter shares a circuit then when the shared accessory is on it will pull the voltage of that circuit down lower than the actual battery/ charge system voltage.

 

OK so if I am going to hook up a Voltmeter that is where I would pull the "power" wire to the meter? If I don't I just don't bother connecting it?

 

Yeah correct if your not hooking up a voltmeter just make sure the sense wire is well insulated and can't short to anything else.