Fuel Guage on 1991 Ford Ranger

The fuel guage is not working and I would like to find a wiring diagram or maybe someone can tell me where the problem most likely lies.

Asked by for the 1991 Ford Ranger
It might be a cracked fuel filler hose. Without the correct pressure in the tank the fuel probe malfunctions.
4 answers
I think the gauge failed in the dash but Autozone has the wiring diagram on their website
OULD THERE BE A WIRE BROKEN, NOT MAKIN A GOOD GROUND.
Guage was working then drop to zero.
I've heard the Ranger's and Explorer's it's most commonly the sending unit. I found this in a google search so you can test your gauge and sending unit.
http://autorepair.about.com/library/faqs/bl845g.htm
you'll need to copy/paste that link. hope this helps!