on the track 3rd to 4th is normal to crunch on 32 gtrs (ive been told it will crunch no matter what gearbox fluid you have in there), just delay the shift an extra second and it wont crunch.. as for other crunches with other gears, good quality gearbox oil should help (shaun at boostworx has recommended to me redline's shockproof).
As for shift light, looking at a simple one, have my eye on the Gizzmo DSII (http://www.modyourcar.com.au/gizzmo-dsii-shiftlight-p5650)