Uk and wrx ecu can be swapped on pre96.
The intelligence for speedo etc is in the sensors/electronics on the back of the dash binnacle, and the output they supply to the ecu.
The cable drive still passes the electronic signal back to the ecu via the binnacle.
Splicing into the maf signal means its probably had a fuel controller such as an apexi safc or similar in the past.
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