I just found your thread today. Great build. I was wandering what you did on the proportioning valve for the drum/drum. Do you know if the one shown earlier in your post diverts fluid in the event of a leak, or does it just control the light switch?
I'm using one from a 69 or 70 mustang that was drum/drum. Thee is a piece in it that slides over and shuts off the fluid to whichever side has a leak (pressure change). Posted using the Full Custom H.A.M.B. App!