G'day,
Temp sensor won't work due due different resistance setting (R32 GTR sensor to R34 GT-T dash) going to a different dash won't help thats why the loom is usually swapped and/or the dash is replaced for an R32/34 GTR dash.
Speedo on r32 gearbox is cable so if it has a R33GTS-T or R34GT-T Gearbox unless it's not wired correctly it should work.
Ecu is a GTR ecu (24U).
GTR powersteer pumps are full hydraulic twin pump unit for rear hicas steering rack, and if you want to use that you would take out the impellers from the rear pump section (in forums somewhere). You should be able to hook it up to your reservoir plumbing and lines to the rack with a bit of messing around.
Hope this helps....
Cheers,
GTRsean