http://www.mcmaster.com
This is for a turbo feed, but you get the idea:



Just omit the 48" line and some of the fittings if you're just plumbing for an oil pressure guage.

That's not my setup, but it should work pretty well. I'm running a GReddy oil filter block adapter with a length of 1/8" nylon tubing going to the firewall, where my GReddy oil pressure sender is. Then my turbo feed is screwed directly into the stock oil pressure sender location. Since it's just the feed line itself, with an AN>NPT and NPT>BSPT adapter, there isn't much weight there, like there would be with the tee and stock sender, It's been working great.