Dim CEL gets bright as car warms up

hey all, new guy 'round here, and i got a good one for ya! i have an 83 TC with an 88 TC motor with a T5 Manual trans. i swapped in an LB3 computer, wired in the ACT, BCS, and Octane switch, quadruple-checked the pinout at the ECM, and of course switched in the big VAM and brown top injectors. i understand how these cars work, i've had mine for like 8 years, but.... start the car cold, CEL comes on, and goes off (normal), but as it warms up, the CEL starts out dim, but gets brighter over a couple minutes until it's completely lit. if you the car has been run recently, CEL is bright from the start and stays on. KOEO codes are as follows: 82, 83, 85, 88. all AUTO tranny codes, which i don't have. CM codes were 11, system pass, KOER, no codes at all. any ideas, oh, i might add that this is the stock 83 harness and therefore, i have a one wire O2 sensor, not a heated one, which i kinda suspect to be the trouble, seeming as how the ECM still gets signal. anyways, please help, lol, car runs great, just a weird quirk. thanks in advance!

83 did not have a CEL as such. The "check engine" light is a combined overheat and low oil pressure idiot light. Did you add the CEL function when you switched to the LB3?

OH! so i either have low oil pressure or i'm runnin too hot is what your tellin me? that could make sense, as the 83 also has no gauges to tell me whats up. i'll put after markets in and figure it out thanks jeff. does anyone possibly have wiring diagrams for the 83 TC?

oh, and no i didn't add the CEL funtion, i still have the stock 83 harness, planning on switching to the 88 for a cleaner setup.

looks like it was overheating, seems okay now that i added more coolant (had the intake off the other day, forgot to refill!!) and fixed a ground wire to the cooling fan. this car hasn't been running in almost 4 years, so i kinda forgot where i was at, ya know, on the to-do list.