Here's how ya do it..
Having sold more electric and mechanical Fuel pressure gauges than I can count and after countless hours of practical install experience, here's my suggestion. There are so many different mounting variations that you can use but the simplest goes as follows:
Go to any shop or store that sells hydraulic fittings, Parker preferably, and ask for a -4 female to 1/8" npt female swivel adapter. Remove the schrader vavle and attach the adapter to the fuel rail. Then attach the Autometer sender to the adapter and run the wire back through the firewall through the speedo cable grommet and attach them to the gauge. pretty simple and very cost effective. ***IMPORTANT.. try to use a good quality fuel rail adapter and stay away from the cheap, highly breakable, soft copper adapters available from several of the TR vendors. They will break from the vibration of the engine and then you have fuel spaying out at 40-50psi all over hot engine components..NOT GOOD! BTW..the Parker fitting is even less expensive, at about $5, than the poor quality unit you get from most of the TR vendors at $15-$20.
Now.. if you want to spend a little more money and make it look nice and fit better in the engine compartment, buy a two foot length of -4 braided stainless hose, a 90 degree -4 female fitting for the fuel rail end of the hose, a -4 male fitting for the sender end of the hose, and the same -4 female to 1/8" npt female swivel adapter to attach the sender with. Run the hose along the top of the valve cover and secure it with some nice hose clamps to the valve cover bolts. It puts the sender further back in the engine compartment and you'll have less sender wire hanging out in places it doesn't belong!
I have some pics available of a really clean, sweet looking install if you want them, just email me and I'll send them along no problem.
Best of luck and DO IT RIGHT THE FIRST TIME!
Tom Houser
Performance Instruments
www.gnxdash.com
GNX-DASH@austin.rr.com