The earliest listing I for the S10 is 82. However you must be careful which one you get as the low gear ratios vary greatly. They all have a tag 1352-XX and those last digits tell the story. Many of the T-5's had 4:03 (4 cylinder & diesel) 1st but V8 Camaro/Firebirds had as high as 2:95 low gear. I show over 200 applications of this transmission with Nissan, Izuzu, TVR (?) and all the others I previously listed. Try to stick to the larger engine V6 S10's or V8 powered Mustangs, Camaro, etc. for the best application. Also watch out for the stick position as that might be a factor.
I can't comment on the metric speedometer but new electric speedo's work well and are not terrible expensive. All T5's are OD but that ratio varies too.
If you find a few jot down the tag numbers and e-mail to me and I'll look up the data for you. There are millions of them out there.
