Hmmm, local [roll stepping in for duty SIR!
Before i humour your questions. Did you even consider googleing?
1) umm go and google how many psi in 1 bar. 7 on stock boost gauge is close to 1 bar.
2) i wonder what on earth a oil meter could be doing that measures kg/cm. Seems to be some sort of space age oil pressure monitoring device.
3) -------
4) over 9000
5) everyones doin it
6) youve got boost they have vtec. Red on tacho means bad. As soon as you touch rev limiter prepare for major explosion