My supercharger when I really get down on it will only hit about 7 or 8 is this normal I have people talkig about how theres hit 10 all the time. Please help.

The PSI that it hits really depends on outside conditions. If the air is warmer outside you can expect a lower boost reading, somewhere around 7-8. If if is well below freezing outside you can expect to hit the 10 PSI range. There are also other slight factors such as humidity, air preassure, etc ... that may also affect it to some degree (even if it is only ever so slightly).

I usually don't hit 10 PSI myself unless it is below freezing out and I am heavy on the throttle.

Mine buries to 9-10 psi ALL the time