There should have been a pamphlet that came with the boost gauge. I found the install to be a little tricky at first too. But I lack patience. Anyways, when you take the battery and the battery holding tray out you will see where all those wires come through the firewall (as the pic with install instructions shows). Right near where the wires are all crammed in and going through the firewall you will notice these little rubber nipples. I simply snipped one of those of with some cutters and fed the hose through next to all the other wires. That's what those nipples are there for. I found that easier to do then trying to figure a way to cram it in with that big bundle of wires. Then I just wire tied it in with all the other wires and placed the battery back in when done. Good luck. You can PM a few of us if you have any ?'s. That's what I did.
