obd diagnostic tool 1991 mazda ms6

gidday from the land of the long white cloud,im looking for a scanner for my 1991 mazda ms 6 efini v6 1.8l,they came in diferrant names around the world,626,capella, cargo wagon, cronos ford orion/telstar i think its a obd 1 but like others i want to make sure i get the right plug ,cheers