I just ordered a new Autometer fuel pressure gauge but can't find much information on how to install it. What's the best and easiest way to get the gauge installed? Thanks.

 

You'll need a sender unit, preferable electronic. The sender installs in the fuel line (use a T fitting) and then connects to the gauge electrically.

Gadget has some words and pics and even a parts list on his Gauges page. Page down (or "find") until you see the paragraph starting with "The electronic fuel pressure sender".