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I got the tester from wcoffey. He has an ad in classifieds. Basically 3" plumbing plugs with a regulator and compressor fitting screwed in as well as a regular valve stem (for hand pumps). Plugged it in, hooked up my compressor, and turned it on. I used the regulator from my compressor tho, not the one on the checker unit, so I can't speak to that. Once it's running, you can hear air hissing. I just ran my fingers around to either feel the air, or wiggled suspect pipes to see if the hissing changed, indicating it was that pipe/fitting that was the problem. The hardest one for me to find was the lower lower intake (the plastic one that feeds to the turbo) on the passenger side behind the headlight. Turned out the clamp was loose.

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