I need help installing a boost gauge in my saab 9000 94.?

i have no clue how to run the tube through the dash. where exactly to i enter the dash? there’s a white tube located in about the center of the rear of the dash, that protrudes into the engine cavitity about an inch. its plugged with a black cap but the cap can be removed. i don't know if this is an option or not? im thinking about mounting the gauge on the left hand side of the dash on the metal brace that holds the roof up. ??

any ideas? thanks

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Answer:
mount it on the dash and drill a small hole for the wire,,, or remove the speaker grille and run the wire along side the grille to the soft/rubbery part in the back,,,either way you gonna have to remove the top off the dash bout 6 screws and a screw on the cluster at the top,,,dont screw in w/out measuring the gauge height to window slant ratio,,,,,

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