I'm just trying to confirm. I'm going to install an oil temp gauge. Like many have done I'm going to install it where the voltmeter goes and relocate the voltmeter to the air temp location.

I considered fishing wires through the harness but the voltmeter seems like it should be plug and play using the same connector as the air temp. And then the oil temp gauge uses the wires from the black connector. (lamp)

It's for an 09 Street Glide....what's the blue wire for?

The first pic is the air temp connector, the second is the voltmeter.

 

Should be able to just plug in your voltmeter. I believe the blue wire goes to the air temp sender.

 

Sorry I can't help, I install the oil temp gauge in the air temp location and avoided the hassle and it's looks and works great for me.

Good luck!