Originally Posted By 383man
The 4 pin ECU will work in the 4 or 5 pin wire harness. So you had a 4 pin ECU box on it and now it wont run with the other two 4 pin ECU's you have. Let me ask if this truck has the original eng and was the ECU that worked on it a factory ECU or an aftermarket ECU ? Ron


I does have the original engine & the harness appears to not been modified & it is set-up for the 2 pin, single ballast resistor.

1967 Barracuda Formula S 383
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2021 Toyota Supra