For those that have installed Vied's on a Wideglide; did you have to remove the battery. I can get to the black O2 connector under the seat, but it doesn't look like I can get to the grey one without removing the battery. This is for a 2013 Wideglide. Also, if you didn't ground to the battery, where did you connect the grounds?

 

I didn't remove my battery. The grey connection is under the seat. I grounded the rear to the battery and the front to the sensor by the oil filter.