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So it seems then that it is a combo electrical/mechanical unit. Do you understand how it works? Mine is purely mechanical.
Boost/vac gauges are one of the few I considerably like mechanical more than one with an electric sending unit. They cost significantly less, and it's not like you're risking a fuel/oil/trans fluid leak in the cabin if something breaks, just air. They also seem to work a bit more "real-time" than one with an electric sender/stepper.
 
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Boost/vac gauges are one of the few I considerably like mechanical more than one with an electric sending unit. They cost significantly less, and it's not like you're risking a fuel/oil/trans fluid leak in the cabin if something breaks, just air. They also seem to work a bit more "real-time" than one with an electric sender/stepper.
Yep, the mechanical one I had buzzed horribly once I turned the boost up to around 20PSI lol. Now it buzzes in the sender unit in the engine compartment, therefore I don’t hear it. Pretty nifty!
 

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Yep, the mechanical one I had buzzed horribly once I turned the boost up to around 20PSI lol. Now it buzzes in the sender unit in the engine compartment, therefore I don’t hear it. Pretty nifty!
That's some strange behavior - I've had the (Autometer) mechanical boost/vac gauge in my Cobalt for almost 12 years and it's dead silent.
 

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Yep, the mechanical one I had buzzed horribly once I turned the boost up to around 20PSI lol. Now it buzzes in the sender unit in the engine compartment, therefore I don’t hear it. Pretty nifty!
Buzzed?

Mine is silent as well.
 

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A Google search revealed it is very common with mechanical ones. Idk.
 

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Replacement antenna delivered to my box today. Installed it in the post office parking lot. Than a run through the car wash. After I got home, I was finally able to take the winter tires off and put the summer tires on. Finally, I de-stickied the front and put on the replacement bowtie.
 
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