a few things.
1) reverse lights
2) speedo drive is diff from auto to manwell.,
3) remove inhibitor swtich on auto otherwise no starto!!!
not sure about tacho... auto computer runs the manual fine ..
if you wanna do it yourself good luck but for the money I paid the auto elec I think it was cheap....
other handy hints on r33 its much easier if engine is out.. pressing is there for slave clylinder but will need to drill holes, fitting the pedal box is a bitch holes are all there though you need to drop the steering col hope u like being upside down for a while hehhehe. also will need to drill the spigot bush thingo out of the auto trans which is a bitch of a job also you will need a decent drill and drill bit. thinks thats it oh and also the clutch cable from the slave cylinder as well..