ok....here we go
r33 box bolts up to rb20/25/30 motor and gearshift is in same spot.
U need : rb25det gearbox, rb20det tailshaft end that bolts to diff, r32 gtr speedo sender, r33 red cog off speedo sender in r33 box u have, custom tailshaft, custom gearbox mount, r33 gearbox yoke.
R33 gearbox is longer so using a auto x member only works if you have an auto chassis to begin with (bolts in).
Cut the brown r32 gtr cog off the sender, and swap it for the r33 red cod (do a search i showed pics on "speedo sender fixed")
Any other q's lemme know