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Resolved 90 ECU in 91 Car?

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joeym4130

15+ Year Contributor
296
2
Dec 8, 2003
philly, Pennsylvania
I need a new ECU for my car, 91 TSi FWD. I can get a 1990 ECU, but I'm betting something is different with the 90 since practically everything on that engine is different wiring. Anyone know if a 90 ECU can go right in or do the wires have to be changed around?

It's a MD128625, Federal MT High-Line. Thanks guys.
 
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i believe two wires have to be swtiched for the tach to work. not sure though.
 
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