These units are kind of pricey but would be easier to find a place for:
square boost pressure Gauge, velcro anywhere, size of a keychain remote. Digital boost pressure gauges in a square package will read boost pressure in PSI. Turbocharger boost gauges in a square package. - Square boost pressure gauge, velcro anywhere,
Maybe there is cheap Chinese version 
By the way - the fuel pressure gauge on my SL could be used as a boost gauge, esp if one with a smaller range could be bought. It has an electronic transducer so that only wires have to be brought into cabin. A must with gasoline!
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Graham
85 300D  ,72 350SL, 98 E320, Outback 2.5
Last edited by Graham; 10-31-2012 at 11:22 AM.
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