996 C2 with Carrera's Tyre pressure ?

[RoShamBo]

I know this subject has been covered before, but I have a 996 C2 with 18" Carrera's & have heard lots about tyre pressures.
Some say use factory pressures, I have heard 36 all round a few times.

Any thoughts on this - tried & tested pressures anyone can reccomend ?

I have also heard that garage air pumps are not accurate. I have a digital pressure gauge - so should I use that to check pressures when filling with air to ensure its accurate ?

Thanks

Julian.