1991 Mustang EEC-IV Build

91FoxbodyGT · Post by **91FoxbodyGT** » Sat Feb 28, 2026 3:38 am

Hi All,

New to rusefi with a bit of experience with a microsquirt on another car. Just getting a thread started on this as I am sure i will have questions!

I am working on getting a 91 Mustang running using a Super-UAEFI and an EEC-IV breakout board. I was able to get some basic things wired up and was able to see RPM when using an arduino to simulate the PIP from the distributor on the bench.

At the moment, I am working through the wiring between the super uaefi and the EEC-IV. I need to figure out some of the relay inputs (10C versus 11C for example) but I need to get a bit smarter via the schematics before asking a questions (still trying find the super uaefi schematics). I will try to keep things up to date if I can.

J