TR - Turbo Regal (any T-Type, Grand National, Sport Coupe)
TV - Throttle valve, TV cable
V - Volts
VSS - Vehicle Speed Sensor
WE2 - Grand National option package
WE4 - Low production Turbo-T option for '87. Package features black T with grey bucket interior. Uses GN bumpers. No Regal badges on rear quarters and no hood ornament.