Digi Dash

[rhumphris]

I am thinking of fitting a 16V Astra dash to a 1.2 mark 1 nova, i still have standard 13 inch wheels does anyone know how much the speed will be off (road speed compared to speed reading on the dash) as i would expect the astra to have much bigger wheels. any way of calibrating the speed reeding on the digi dash?

[nova302]

there is a little switch on the top of the dash with 1 or 2. It should be on 1 the astra gte wheels are 14" so it shouldnt make much difference

[novax]

Generally if you go up in size with your wheels the sidewall of your tires goes down. Therefore the rolling diameter remains very similar, so you'll see next to no difference on the speedo. I'm running 16s and all seems well.