For '95 OBD1, get an ALDL cable from pcmperformance.com. Get your computer tune from them as well. As mentioned, use Freescan and you should download Datamaster for datalogging. You get 20 runs for free.
For OBD2, someone else will know. Expect it to cost more.
'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.