a dyno is NOT needed for tuning
in fact, you are going to have all your trouble with drive ability at NON WOT conditions
part throttle transitions and closed throttle are THE hardest.......
make no mistake, if you tune yourself, it can take 100s of hours of logging if you are not up to speed on how the strategy works
you will spend 100s in fuel going no where, trying to tune
you run the risk of ruining your engine
i suggest your most econo method is the stock ecm and tuning device
there are no cheap shortcuts in tuning, tuners want to get paid, and they know when they are good, and charge top dollar.......and so they should.
just a few hints, good luck
89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.