@Zephyr, I am on the western slope, hopefully that CARB stuff doesn't make it here anytime soon. None the less glad you got it figured out. Also I would recommend WY or SD over NE for tax reasons, but that is just speculation through conversations with friends.
To everyone else, can't you just short 2 pins (A & B
I Think) on your OBD1 connector and have the CEL illuminate even if there are no stored codes (No ECM)....?
I do it on my TBI V2500 Burb (gasser) just did not know if it works for all OBD1 stuff across the manufacturers.