I'm not sure what type of intake you have, but I have a GT-40. With the GT-40 there are a couple plugs under the upper intake on the drivers side that you can hook into. I just purchased a brass 90* fitting from Home Depot and used the crush fitting supplied with the gauge.
Make sure that when you are tightening down the crush fitting to go finger tight and then a 1/4 to 1/2 turn after that. Anymore than that will splice the nylon tubing, ruin the crush fitting and you'll have to do it all over again. Just my advice.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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