what do the numbers on the boost guage mean?
 

i tihnk that 0 - 10 is psi right? or is that only a turbocharger? and what do the negatives mean?

The negative numbers indicate vacuum (in. Hg = inches of mercury). Positive is boost.

Yes, in PSI.

so on the guage what is "boost"? 0+?

Anything above 0 is boost.


Read this for the technical info about pressure.

http://www.iprocessmart.com/techsmart/pressure_help.htm