Hard to say. It's certainly theoretically easy (until i see mine working I'll reserved judgement!) to get the rpm, speedo, backlight bulbs, and most warning lights working. I can't see why the fuel gauge would be hard as that's just connected to a variable resistor + float on the type-r, though what the calibration is I do not know.
There is however a multiplex feed to the clocks, which so far as I can tell although it carries an array of information, nothing is of any use to any of us, except the coolant temp signal. The coolant temp signal originates at the ECU - perhaps it'll work without the multiplex unit (there is continuity from clocks to ecu in the OEM isntallation).
As for speedo calibration, it's calibrated to a wheel and tyre size combination, so the fact the type-r runs 17" wheels is not really relevent.
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