Map sensor or lack of?

[VeightTT]

Hi, I have had my HFS-4 (3.1) system installed (professional install) in my '13 Audi S6 for a few months now and I have never been able to get a smooth flow on the gauge, after extensive testing this week I discovered that the system is not reading any boost signal. I took it back to the installer to make sure all the wires are hooked up properly and it look like they are. My car is running 20psi the board is still configured at its default setting of 3.5bar. with the board configured to trigger off MPS should I still be registering at least some flow on the gauge? or is the 3.5bar to far out of range to pick up the signal?
if triggering off IDS with the system not reading any boost should it still behave as expected? Or is the lack of boost signal throwing everything off? I still have a few questions but I will leave it at this one for now.
The car is a 4.0 twin turbo with 2 1cc jets installed post intercooler one in each intake tract.

I appreciate any help
Cheers
Andrew