I find this interesting as well as 'deja-vu' as this time last year I bought a previously converted B3 (from 1.6td to 1.9 tdi using the engine & wiring from an audi 80, maybe 1993 it was converted by 'TSR' as a demonstrator??) but the company who did the conversion just overlaid the audi's more simple ecu & wiring over the original B3 td engine loom, this was messy & lacked the diagnostic connectors (& wiring to ecu!!) as well as having the throttle potentiometer operated by the original throttle cable mounted below the water expansion bottle (great when the car has a doomed head gasket
)
I re-converted with a Mk3 golf engine/box/loom & B4tdi pedal box, only real issue I have is the mk3 loom doesn't fit as neatly as a B4 around the bulkhead & inner wing where the ecu wiring runs (I live in Wales, UK so RHD)
and I have used the original B3 td inter cooler & pipework as it was fitted (the tdi's inlet air temp sender is just 'dangling' on top of the gearbox
) ) as I have not had time / got around to fitting the B4 tdi pipework & inter cooler that should be a direct replacement hopefully.
also fitted a B4 tdi cross member to use the later 'hydraulic' engine mount & as the original cross member was rotten with a worn steering rack (mk3 rack identical but may have different track-arms / drumsticks, mk3 & 2 crossmembers interchangable with each other but NOT B3 & 4 as front mount is diferent, mk3 wishbones fit B3 & 4 but slightly diferent))
As for the shifter cables all I can say is that others have said there's no problem using the Mk3 shifter / cables in the B platform as a substitute. I've also read other comments that say they're too short. Best to look at the assembly in Etka and see if it's the same between B4 and Mk3.
I tried mk3 stick/shifter & cables in my B3, the cabling was too short & getting first gear was just impossible
(shame as my '89 has a horrible gear change, probrbly doomed cables)
been thinking of the 02j? shifter mod for a while now, another of those jobs on the list
on the plus side, cruise is easy on the tdi as the wiring (4 wires) is in the loom by fusebox just needs lengthening & connecting to stalk
also the speedo sensor fits in place of the cable on the gearbox drive (but you then need a speedo cluster with electronic speedo & it's sub-loom) just vag-com to activate
you can use petrol dash clusters & their sub-loom to fusebox, just no glowplug light, but higher taco limit & maybe a flashing water level light but this is the miss-match of the looms & fusebox,
http://www.clubgti.com/showthread.php?183502-coolant-level-sender-wiring
might explain.
I have one in mine as the proper tdi clusters are sorta hard to find with mfa & electronic speedo
Rich. (too many cars, not enough time)