we are using the stock bosch vr6 sensors with modified code using easytherm.
we have one of those lasers that measures temperature, the CLT definitely does not read the outside temp, but if i recall, the IAT does read correctly.
We've been tuning it for 5.5psi, and so far everything has been great. Still needs some tweaking but we can get into boost.
Once we get this UEGO working with the MS, some datalogging will make tuning for 20psi WAY easier.