here's the story for the HR31 - i'd assume it same for the 32.
you need:
- R32 GTR Pinion Assembly (32707)
- R32 GTR Cog (32703)
- Pin to hold Cog in the assembly (32712)
- Washer thing to hold the assembly to the box (32718)
all up cost me $140 even for everything, but my speedo is SPOT on.
you take out the old one, put the cog throught the housing and hammer in the pin in the side so the cog doesn't fall out, oil up the housing and the gearbox case where it slides in, using a rubber hammer, bash it in till the groove sits flush with the box, (there is also a mark at the top of the pinion housing, have this point dead vertical) put the washer thing in (you'll know what i mean), tighten it all up so it doesn't go anywhere, slap on your speedo cable, and take for a test drive.
Chris.
edit - well scrap that idea. got 160kms out of it and the gear wore away - teeth are cut the wrong way. didn't pay too much attention just slapped it in and bang.