There are links to gauge install in this thread:
https://www.dieselbombers.com/chevy-...uum-lines.html

I would say that you are going to need a quality scanner to first diagnose the stepper motor.

 

trucks been running pretty good ive been driving it while the truck is warm it cranks right up no problem but when it sits over night and i try to crank it in the am its really hard to get it going.. any ideas of what i can do. and im going to go ahead and buy a pmd anyways wheres a good place to buy it from? or website

 

I think you might be the victim of leaking filter manager O rings.
The fuel heater in the bottom and the water in fuel sensor in the side could be letting fuel leak out overnight causing air intrusion and hard starting.

That or you may not have properly working glow plugs?

There are a great many PMD purchasing optionsdo some searching and then report what you find-then better advice can be given on each vendor.

 

thanks.. ok i put a new battery in the truck now the truck wont crank at all it would always crank before i put the battery in. now my glow plug light when i turn the key over blinks and the glow plug relay clicks open n closed open and closed about 5 times then the glow plug light shuts off is the relay no good... i have no idea on this one i'm a little puzzled any help would be appreciated

 

Bad battery cables with corrosion or a bad connection,it also requires 2 batteries to get these trucks to run.

 

I have two batteries they were both side post and the new battery was top post so i cut the exsisting cable and bought top post ends tightend everything. Up and i put a brand new glow plug relay and replaced a bad glow plug and still no start it turns over but wont crank up the glow plug light comes on as a solid light then blinks 5 times or so never done that before i also checked all glow plug wires to make sure i had power and i did also had power at relay i just dont understand could my pmd just finally died?

 

Crack an injector line loose and see if any fuel is making it's way to the injectors-if no-PMD
if yes pmd is ok likely

Be sure to try starting after the glow plug light goes out the first time.

 

ok i will try that tomorrow. thanks ill let you know what happends is their any more info that would help you out a little more on diagnosing the problem? its just really weird i drove it home from the auto part store parked it. while i was changing the battery then it wouldnt crank up anymore so weird but thanks for the info. i dont want to sound like a complete idiot but where exactly is the injector line?

 

okay i got the truck to start finally but the starter silonoid started smoking really bad i opened it up the ground wire was melted the inside of it smelled like an electrical fire is it possible that starter wasent getting the correct voltage because the siloniod was going out maybe thats why it was taking so long to start and wouldnt that also give me a faulty ground if it was severly melted??

 

You may have just had too low a cranking speed from a burnt out starter?