To the OP. I've found FSIP to be a great resource. They have a forum there as well so you might want to post your questions there also and see what they say, but the suggestions made already are good ones. As for this old tech vs new controllers, these old controllers may be crude and bulky, but they have stood the test of time and many are still working fine. Parts and tech support are easily available as well. That can't be said for most of the new high tech EV controllers most guys on here are using.FSIP.biz sells rebuilt cards to fix this problem
(they also have the tech manual for it as a FREE down load).