Al what I did with mine is kept Heath h/o GM style plumbed in, and paralleled the FRB-5 off the outlet port of the Racor and back in to the filter mgr, then relays to both with switch to control side of both relay, the normal power from PCM/OPS is the control current for the relays so I maintain safety feature, using switches to break that path and I can run one or other of the pumps, and both I guess if I really wanted to.
& Yes I know worthless with out pics, I'm home for Christmas, and some presents for you guys is me catching up on some posts/pics of latest things I've been doing