what you mean? The ball and spring ones are reliable, people have been using those for the longest. You can even make one yourself using like 10 bux of stuff from home depot.
you can even mount a flip switch in cabin to bypass it.... so stock boost or stock wastegate spring boost vs whatever your increased boost is at.
They are reliable, but no reason not to have a boost gauge.... $20 that can save your motor sounds like a no brainer to me. You can even get the little discrete digital ones now.






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