Hi,
If you could state your ecu-info then it might be a bit easier to answer the question.
RPM can be logged already from 1991 cars.
If a 1994+ vag-car has a maf, it's also loggable.
If it has a MAP-sensor, of that year or earlier, it's also logable.
btw.. on a Integra Vtec Turbo there ain't no M3.8
Cheers,
PvL