Someone e-mailed me with questions about this. I learned about this myself from others here. I will attempt to make a few posts with pictures to explain what I have done. So far it works good but I haven't "cranked" up the boost yet. I have to install the two o-rings on the turbo as mine are bad. Any other questions/comments are welcomed. Always room for improvement.

First pic of the guage itself inside the cabin. It is a lighted one from JC Whitney and it works well.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
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'72 Triumph T100R