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Discussion Starter #1
I am wanting to install a boost gauge in my '99 A4. I have been doing some reading about how to do this, however, I am not sure which vaccum line I need to splice and why I need to run the line into the ECU under the hood.

Does anyone know of an online tutorial (preferably with photos) that shows a step-by-step install of a boost gauge in an A4?

Thank you,
 

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