Stock Turbo Boost Gage-'90

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Originally Posted by Benesesso

Thanks, but this car seems to have gone nuts. There is a strong hissing noise from the boost gage area, so there has to be some vacuum line in there.

Originally Posted by Benesesso

Here's what's really strange. I plumbed a small vac. "T" fitting into one of the intake air chamber vac, lines, and ran it inside the car.

WTF? It's stupid shit like this that's why no one's ever going to be able to help you... did you just forget that YOU added a vac line where the NEVER WAS ONE? Jebus.....

Originally Posted by Benesesso

Here's what's really strange. I plumbed a small vac. "T" fitting into one of the intake air chamber vac, lines, and ran it inside the car. As long as my mech. boost gage is plugged in, I can easily hear the noise. But the second I unplug the gage, the noise stops.

Sounds like the diaphragm in the gauges shot. Put a bike pump on the reference port and see if it hold pressure.