Closing this one out to help some one in the future if they do a search.

The Miprom's used a Vacuum Fluorescent PI. To keep the original controller and use a new LED PI, you need a Vacuum Fluorescent to Binary Converter. You can get that from Kone or from CETEK. (CETEK provides the wiring diagram and excellent tech support.) At the present most fixtures run off of micro-comm, if this is the case you will still need a board that converts Standard binary to micro-comm. We were using C.E. so we got binary converter from them.