Discussion and technical advice the SW20 MR2. 3S-GTE, 3S-GE, 3S-FE etc
Anything and everything to do with maintenance, modifications and electrical is in here for the Mk2.
I think you'll find the rev 1 has a mechanical drive for the speedo, where as rev 2 on uses an electronic speedo drive.
Easy to spot which is which if you take a look at the back of a rev 1 cluster you'll see the threaded sleeve poking out where the cable is attached for the mechanical drive.
Paul