No,the tach is run by alternator.

Crank sensor and Optical sensor are used by the ECM to operate the engine-together they report timing and RPM to the ECM.

Have you checked for trouble codes?

I have glow plug secret a and turbo charger boost but that's bc I don't have my waste gate hooked up yet so that is all this is getting really frustrating!!!

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I am getting no codes for the sencers that I am disconnecting

No idea what first line means?

You should get codes when you disconnect sensors and try starting,maybe there is an ECM power/ground problem?

Glow plug sercet A , and I checked the grounds twice so the only thing it could be is the ECM right , is there any way to check that to see if it's wrecked

What is a sercet?
No idea what you mean when you talk about secrets?

Are you sure you checked all the grounds?

Both ends of both battery cable grounds.
The 3 ground wires on the coolant bleck off plate stud at passenger side rear of engine,1 wire on it's own ring termibnal and 2 wires share a ring terminal.
IP/PMD harness ground fastened on top of the IP under an optical sensor screw.ONLY acceptable location to mount that ground!

Those are the ones that need to be clean and tight.

Sercet=circuit :)

Lol yah sorry dude not a real awesome speller here

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So yah lets re cap here So here we go truck stalled like someone shut off key, the usual for 6.5, long story short, I changed the IP, all injectors, crank sencer, ignition wiring harness, tried to bleed injector lines and no fuel is coming, brand new lift pump so I am getting fuel to the ip bc I cracked the "t" valve and had tonns of fuel. Fuel return line is clear, no codes except for glow plug circuit A? Not sur what that means yet but I do have glow on all my plugs ? Also checked all my grounds with a ground test volt meter, I have power to all my plug ins on my ip, all of my fuses are good , I have good connection from all of my plug ins right behind my fuel filter to my ECM, the IP I put on is brand new so the PMD is brand new and has power to it and the engine shut off solinoid has power , I have 2 brand new batteries, It has to be electrical bc I have done all th macinical stuff, is it the ECM bc that's another 500 bones that I do not want to spend

Ok changed th ECM and still nothing ?

Need a more methodical approach rather than just throw parts at it.

Have you ohm checked the fuel solenoid?
Done the accurate diesel no start test?

Yes I ohm checked it and I did that no start guide twice just to be sure, what is that other line that goes into the pump besides the fuel return line ? It's about 2 inches or so from it and it,s got a rubber hose just like a fuel return line ?

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How does a guy check to see is the pmd is getting working the way it should ? Does that click when you hook it up like the fuel shut off solenoid ?