Right now I have Autometer Ultralite gauges (Boost,EGT,Oil Press.)
I have a different gauge for fuel pressure because last year when
I installed it, Autometer didn't have a Mech. 0-30 psi Fuel pressure
gauge that I could find. Does it exist ? Don't want electric , must
have all mech. gauges

 

I dont see a 0-30 psi mech fuel pressure, only 0-15 psi and 0-100 psi (this one is not an option):

http://www.autometer.com/cat_gaugeli...&opid=4&szid=2

They'll likely make you buy and isolator:

http://www.autometer.com/cat_gaugede...id=3160&sid=11

IMHO, autometer doesnt target their guages toward diesel enthusiasts.