Dennis
I have sd 1525s on my machine and will be using p100s, I consulted with a cnc repair men familiar with sd 1525s and a electronics engineer
and when I get home Tuesday I'll post the information here about pins, pots on the sd1525 and which go to +,- &, ground between sd & p100s.
I'd post it right know but I don't want to steer you wrong but thought you'd like to know it's coming
Ben