sorry chap, but i think your wrong.unless you have an electronic boost solenoid controlling the boost itll never be accurate or safe.the boost pressure can rise and drop, and will do with a bleed valve type. electronic solenoids adjust to suit, they can also be set up with a safety cut so if you do get a boost spike, itll sort it. bleeed valves are a cheap and easy option, but its cheaper to get an electronically controlled one than a new turbo or internals.