Boost gauge not working anymore??
It sounds like it's not reading vacuum, either, right? It just doesn't sound like the gauge would just quit like that.
If for some reason you can't trace the whole line, just for a test, take the guage out and connect it directly to a vacuum source with a short length of tubing and see if you get a vacuum reading.
The ones I'm familiar with have vacuum AND boost on the dial.
I hear anything other than Autometer are famous for being poor quality. May sound like hype... but, that's what I've read from guys that have bought gauges other than the Autometer.
Maybe you should get one. Only 35 to 45 bucks, depending on where you get it. And, having vacuum readings is helpfult, too. You always know if the gauge is working, even while cruising, and it helps you detect other problems.
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But, you SHOULD be able to find a small enough screw clamp. They make those things where they can almost have no diameter space. You have to find the right design where it distrubutes the clamping equally around the tube.
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