yeah, dalton have a good dyno, but they can't record air/fuel ratios on the chart (only in real time) and they also get pretty anal about how close you can stand to the dyno and watch your car getting tuned/dynoed, so it may not be the best in terms of spectator viewing....
So i think if you could persuade geelong tuneups to get a day going it might be a better idea...
what do you think? have you had any experience with either shop?