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I need to fit a boost gauge to an eyeball vent, just want to know if its the
2 1/6\" or 2 5/8\"??

Also if someone could post a pic of one fittedhat would be handy too:)

Cheers Rob

both can fit
52mm will need the vent outer ring,
60mm wont.

i have defis in mine.

Thanks Mark, i ordered the 60mm from Rocket today, should be fitting it Monday when it arrives.