91+ ecu in a 1990?

[boostedtsi0069]

Ok i know i have to swap pins 6 and 14, my question is do i get the 91+ gauge cluster and just swap it in. And can i just keep the 1990 ignition stuff w/o swapping it out? Thanks any experience with this will help?

 

[1990whitetsiawd]

http://www.dsmchips.com/1990ecu.html