General 93 turbo ECU into a 90 turbo car

[Forces32psi]

i did a search for this allready and couldnt really find what i was looking for. my question is if you put the 93 eprom ecu into a 90 that didnt have the eprom will i just have to switch 6 and 14 on the harness and thats it?? NOTHING else will need to be wapped out or anything?? im running a vpc, afc2, 93 eprom ecu and i have the buschur C.O.P. i also have the auto meter tach drive for my shift light but im nto sure if i need it on the 90. my problem is i cant get the car to idle and i dont know if its just my settings on the vpc/afc or one of my sensors on my throttle body is bad, not shooting any codes. just put a new motor etc in. and i have the 6/14 wires swapped and couldnt find anywhere on here if im suppose to do that w/ the eprom ecu. or just dod that and nothing else. thanx in advance. steven

 

[steve]

It's all been documented here before.

'90 cars will need some modification to the ignition circuit for a functional tach when using a 91+ ECU. The simplest changes are to use a '91+ PTM to provide the ECU with it's tach gate signal as shown on the DSMChips site.

Pins 6 and 14 need to be swapped on any change involving 90 and '91+ cars and ECU's since the two pins changed locations between 90 and 91.

Steve

 

[Forces32psi]

im not running the stock tach though, and i have a tach drive. so my question is or maybe im just wanting to make SURE that ALL i need to do to correctly run the 93 ecu in my 90 is to switch 6 and 14 wires around correct?? being that the car wasnt a eprom car before i put this 93 eprom ecu in wont make any difference correct?? thanx for the help...steven