Re: XC GS instruments into XB 500. Possible?
an xc has a completely different shape dash to an xb. not only is the dash front different but where it fits up against the windscreen is different to.
your loom will be very similar, but only in the colours of the wiring. the two dash's have different plugs/terminals etc. i'd definitely put it in the "too hard" basket, which isn't something i do often when it comes to modifying cars.
i think the best thing to do would be track down a V8 xa/b GS or GT dash and fit that instead. i can help you out with a GS dash, but i only have the small gauge's(oil,petrol,temp,volts), but then again, they're the hardest to find. i don't have the tacho. sydney's a big place, you should be able to find something there, but if you get desperate yell out and dig them out for you.