[Mayfield]

I have a 06 5.3 4l60e DBW going in to a 85 c10. My harness was done by speartech. I'm confident that I have the wiring correct. But wanted to double check.
Harness from truck that had factory cruise ( 4 wire).
Grey
Blue
Pink
Green
Wires coming from harness
Grey- cruise on/off
Grey/black- cruise resume/accel
Blue- cruise cntrl set/coast
Lt blue- cruise cntrl normally open brake switch

Truck/ TAC module
Grey to grey
Blue to blue
Pink - ingnition, leave alone. Verified 12v
Green to grey/black
This seems correct to me, other than wiring up for the brake switch.
Can someone verify this for me?
Also, I'm running dakota digital vhx gauges. It requires a ground signal to activate the cruise indicator light.
Can I tap off the blue wire cruise set/coast for a ground signal?