These ECUs are very closely related to the 1990 1G DSM ECU. In fact, they're so close you can almost use them interchangeably. The one item a Colt ECU does not have that a 1990 1G DSM ECU would is boost gauge control simply because the original Colt did not have have an ECU-control boost gauge in the dash anywhere. We can, however, modify this ECU easily enough while it's here to include this functionality if you want.