it's a '91 TT Auto Federal ECU.. so the ECU will be looking for AIV's.. if your chasis does not have them, you will likely want to get the ECU Chipped or find a '94 ( I think ) 8 bit ecu auto on E-Bay.. then you will not need the AIV's.. [ http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF ]
Or just get an ECU from a Supplier.. Is the Chasis a TT Chasis?.. or is it a NA Transplant to TT.. as there are wiring/Control differences with the ECU Electronics..