I know many of your old farts here have a collection of schematics or at least manuals....
I can not find the manual or maybe even the schematic that sometimes comes with these manuals for a :
Fincor 105456401 , 1900-77 This is a PID dancer controller with a tach following option.
If need be I can reverse engineer one using TinyCad or some common free electronic CAD program so I can study it to get a better understanding of the option dip switches and pots on it that don't seem to have much obvious use.
Jamie