[Richard]

This is a bit of a mash up, but maybe will help.

@Chester Stone installed one in his coach. He mounted the coach based break away unit and tank on top of the hydraulic reservoir tank, IIRC. If he sees this, knowing Chester, he will have tons of photos and info.

I have an M&G. I took the brake line tap at one of the air brake chambers for the tag. I removed the fitting from the brake chamber, replaced it with a tee, and that provided the tap into the coach air braking system.