What's is the ops and where is it located?

The OPS is the Oil Pressure Switch/Sensor
It is located in the engine valley just in front of the fuel filter housing below the glow plug relay.

6.5 turbo diesel
 

So I replaced my ops I figured out my needle was bad on the gauge.. Turned over the truck and it keeps stalling it runs then stalls I just don't understand what's going on. I'm putting a new fuel filter on it now it was really dirty see what happens if it doesn't work what my next step pmd? How do you check to see if they are working properly

Since you never included the diagnostic checklist I asked you to do,I can only guess that the PMD is the problem.

The only way to test for PMD failure is replacement.

This diagnostic has helped some though:
www.AccurateDiesel.com - PMD Installation Instructions - Accurate Technical Services, LLC

I agree with the PMD being the possible culprit to your issues. what is the current state of the PMD? Location? age? miles?

1996 k1500 6.5 turbo diesel 323,000 miles
 

1.truck is hard starting
2.once started truck hesitates at times then clears back up to and idle.
3.once driving the truck runs smooth but once holding at lets just say 40 it kind of jumps lightly.

Parts ive changed out after the symptoms
1.vacum pump all and new vac lines
2.belt tensoner & belt
3.new air filter new fuel filter
4.oil change and cleaned motor new oil pump and gasket
5.oil sending unit

Codes my truck read

1.po216- injection timing control circuit

2.po406- egr sensor A circuit high

3.p1656 wasteate solenoid control circuit


can anyone explain the codes and what parts that would be associated with the codes so i can get the parts and get this fixed thanks..

---AutoMerged DoublePost---

The current location of the pmd is original never been changed the truck has 323,000 miles on it.

P0216 is for the stepper motor on the IP which controls timing.
P1656 is for the wastegate solenoid
P0406 is for the baro sensor I believe?

With those codes you may have a faulty ground connection at the rear of the intake at the common ground stud,at least that is where I would start looking.

1996 k1500 6.5 turbo diesel 323,000 miles
 

whats the stepper motor?
I just bought a turbo boost gauge today and was looking around to hook it up didnt really have any ideas i done some researching do i have a vacum line on the intake anywhere to put a why i kinda looked around didnt see anything if not i assume ill have to tap in somewhere. If i do need to tap in somewhere wheres a good location or a few different locations? thanks youve been a really big help thanks

the steppeer motor is an appliance on the passenger side of the IP that conrtols the timing when commanded by the ECM.

To install a boost gauge you must drill and tap the upper intake to accommodate a barb fitting or buy a boost bolt from leroy diesel to take the place of one of the center upper intake bolts.

So do you recommend I replace that part? So if I buy the boost bolt I wouldn't have to tap into the intake? If I did tap into intake to you recommend I remove the intake? A picture of locations that would be safe to do so would be helpful