Idea - cheap pressure sensor

Pressure transducers are usually expensive, right ?

so here is my idea: take a cheapo pressure gauge, remove the lid/glass whatever you call it (I am not a native speaker of english, sorry :-D ), glue a small neodymium magnet to the dial, put the lid/glass back on... glue a hall sensor above the centre of the gauge... done

obviously one'd need a hall sensor that provides analog output, not those that just turn on/off when polarity changes

so what do you guys think, is it a good idea ??

Does it work? If so, I think it is a great idea.

not sure never tested it... though I guess it should work

CHEAP pressure sensor ? Try this one as it works really well IF you can source the stuff .
About 20 years ago , IC’s use to be shipped on a " carbonized foam rubber " . This stuff was to combat static for CMOS devides etc . ANyway , this foam is RESITIVE in nature . It changes towards a LOW value when compressed . Just apply a small metal foil pad on each side of the foam and that’s it ! It works just like a potentiometer .
ANother PLUS of using this stuff is that it can be cut up with scissors to make custom pads .

Hope this helps .