jut go back to ebay and get a speedometer cable for vdo spedometers
38" is about right and they are around 20bucks
if you have a 2004r and want lockup to operate via the speed , or have a chip that looks at speed for timing /fuel changes youll need a vss sender that went inline under the hood , good luck with that as they are two pulse per rev senders that are discontinued and the only in lines available have the wrong pulse rate and would require using the casper vss converter ,
i have instructs for this dash,
the plastic backer needs to be cut extensively and the duct work behind that needs a 1" hole drilled and a short peiceof poly tube installed to allow the speedometer cable to reach the vdo speedometer.
if itwas used it should have the bezel and the idiot assembly with new filter lens installed (originals had to reuse your idiot lamp pod )
the wiring isnt bad just run the nylon boost tubing to the boost gauge , plug the main connector in (tape and ziptie it) , screw the speedomter cable in and slide it in , pop the bezel on