You can grab the boost signal off the compressor outlet by adding a "T" into it. The issue with this is that you will be seeing compressor outlet pressure, not intake manifold pressure. On the other hand... The cobb access port displays and logs real manifold pressure, so as long as you tune by that, and just use the the manual in-car gauge for looks, that should work fine. It will read 1-2psi higher than your actual manifold pressure, but really, since your not using it for tuning, that's not a big deal.