IPD DOES have info on this deal but you may not have gotten the right guy.
(At least I THINK Shayne and certainly Scott are still there and either of
them could have told you.)

What it amounts to is changing the apparent reading from the coolant temp
sensor to make the engine think it is colder and thus make the mixture
richer. I hope someone will correct me if this is wrong but if I remember
correctly you put a pot of 10K or 20K between these two connections
and that can make the mixture richer.

I will have to say that IPD saved my neck a LOT of times while I was in
Panama, especially between about 1981 and 1996. I owe them a lot for
putting up with me and helping me through some fairly difficult times.
They were always VERY patient and courteous.
--
George Downs Bartlesville, Heart of the USA!