for a 91 integra, use a 90-91 harness they are all the same. no vtec harnesses wer available in the US for the integra.
A 92-93 half arse obd1 harness will not plug and play into a 90-91.
as far as obd1 or obd0. if you use an obd0 ecu, use an obd0 dizzy. same for obd1 ecu and obd1 or obd2 dizzy.