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Drill a 3/16" hole on each center mark see Figure "D". Do not attach the panel to the dashboard at this time. STEP 3 - ROUTE THE AIR LINE A) AIR TANK AND COMPRESSOR TO GAUGE PANEL Cut a piece of air line tubing that will reach from the gauge panel mounting location to the air tank. Insert the end of the air line tubing into the T-fitting on the back of the gauge panel. Route the air line from the gauge panel to the air tank see Figures "A" & "C". It may be necessary to drill a hole in the fire w