Fuel pressure tester.
 

Does any company make a fuel pressure tester designed so it can be read while driving.

Not that I know of, but you could just install a FP gauge from Autometer or something.

You mean to mount in dash???

i haven't hreard of any, too much of a risk(leak) you'd think...

Not specifically that I've seen.

I simply found fuel and pressure rated hose and extended my fuel pressure tester hose to about 7 feet.

Will try to get you a picture, but imagine that the hose is simply longer. I can now run it up under the hood and in a window. Hold it in my hand while driving. ;)