Installed a boost gauge but.......

[DieselHead]

I too bought a cheapo turbo boost gauge from JC Whitney and recently installed it. I took my car out on the road and tried to keep an eye on the gauge (trying not to compromise my safety of course). Under pretty hard local street acceleration (the car didn't really get above 40 MPH though), I only noted about 8 or 9 psi. Is this really abnormal? I always thought my car felt decently peppy, for a diesel, but with everyone else dialing in 13.5 psi with their boost controllers, maybe my car isn't performing the way it could. I spliced into the tube that goes from the rear of the intake to the overboost switch near the brake booster. I think this is where Speedy cut into his lines too. Please let me know if I'm just being paranoid. Thanks.

Alex