Ordering A Boost/v Gauge

[volvos60t5x]

Waittt a minute, does the boost gauge only have to be hooked up to the vac line and from there it can tell boost in psi and vac pressure?!?!?!?

mm i thinks so i just connect to the line of the manifold like the R pics on this forum. The boost gauge works fine. I just that my car in stop make like 20 vac with the A/C makes like 15.

On second gear makes 20 psi on the range to 5000 rpms after that if start de drop to 15 psi

Third gear makes the same 20 psi and after the 5000 rpms range it droms to 15 psi and stay there.

Forth gear makes 20 psi and stay there all the time.

Fifth gear does the same 20 psi and stay there all the time.

The boost gauge help me to identify the problem that i have, i think the bov valve(bcp) is not working cause after some very hard accleration the car doesnt make more than 6 psi.

so what do you think when the car is running fine, is normal to drop from 20 to 15 psi on the 2nd and 3rd gear?