Started to install the boost gauge but have a couple of questions.I disconnected
the stock turbo hose and found the hose size was different than the hose that came with the gauge. What is the best way to connect into this hose and then into the isspro gauge hose.The tee supplied will fit the stock but not the new hose for the gauge.I pulled the light switch out to connect the power, I found the pink wire but not the black ground. I found a white,pink and 3or4 white with a green strip. What other wire besides the pink should I use? Thanks JoeNH

Those hoses usually have a lot of give to them and you can probably get it on there. Failing that, there are universal tee adapters out there that allow you to connect various sized hoses to them. I suggest using small clamps on the hoses since pressure will be present.

As for the ground wire, any ground will do, there are a number of them under the dash but I would recommend terminating the gauge's ground wire with a round connector of an appropriate size and connecting it to ground through one of the available screws under the dash.
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Bob Kraushaar '94 945T, '91 940T(back from retirement), '88 240, '84 242T, '94 F-150, '89 560 SL, '68 Shelby GT-500 KR