ok gotta admit i forgot all about this till an hour or so ago
anyhow i've stripped a dash unit apart and got the dials out
the guages for boost/fuel and oil/water are simply two thin sheets of acrylic
however the speedo and tacho dial faces appear to be printed acrylic..
this means that witha rub down with fine wet n dry will leave you witha clear plastic plate which you can then have re-printed. The warning lamps are coloured by removable sheets of couloured acrylic.
im going to try an find someone who can print these up as im interested now i've got it all apart
i think a signwriter will do the job.. fingers crossed...