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hi mate

diesels don't generate a vacuum so you only need a gauge that reads positive pressure.

diesels also run higher boost than turbo so 2 bar one should do the trick.

IIRC, they hit up to 20psi = 1.5ish, 25 psi = 2ish should be good :D
 

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Youll struggle to find just a positive only gauge as they are all designed for petrols mainly.I wouldnt worry about the vacuum so much just try and find an electrical one with an air sensor so the sweep movement is smooth like your dials.BEWARE of cheap crap £40+ minimum and you will want one upto 2 Bar
 
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