Scirocco Register

I've got to get an electric fuel pump for my carbed GT11 as my new engine does not allow fittment of the original mechanical one. There are two choices of pump, 1.5 - 4 psi or 4 - 7 psi. So does anyone know which would be suitable for a 1.8 rocco.

Cheers

For future reference the best info I've discovered is that Weber recommend 3-3.5psi for the dmtl type carbs.