Time for an LS swap??

what is flash code 12 ?
Lol. OBD1 and OBD2 are very different animals. On OBD1- you used to be able to do a key sequence, and the lights would flash to show codes.

I had a buddy LS swap an OBD1 camaro. by the time he replaced the entire harness, Dash, gauges, SOME of the OEM stuff worked. lol