Parker P-38 owner, HSS. I already replaced Parker HB w/ SD JB, added micro DPDT to isolate A-coil. Very nice. Want to add two, new-to-me used STK-S1 stacks and add DPDT to each of them, to isolate the upper coil. ??? Which wire does what? I've scanned the diags at SD, but haven't seen what I'm...