90's do use slightly different ECU's than 91-94. I believe only 2 wires are different which may be your problem. Hopefully LightningGSX jumps in with specifics.
The person helping me is Kyle and he also has a 90 Talon and he hooked it up the same as his car. Unless it could be something with mine being FWD and his AWD, but I doubt it.
Hybrid Mode
