2005 F250 gauges drop after 3 seconds of ignition start losing Turbo PSI RPMs temperature oil temperature water after driving transmission stays stuck on 3rd or 4th gear take off very slow cuz it's stuck on Ford won't shift manually diagnostic won't read no communication checking all harnesses ruled them out need help

 

It sounds like the vehicle is going onto limp mode and a possible shorted sensor is preventing communication.
You have possibly 2 choices as I see it, (could be wrong), either have someone with a high end scan tool check the vehicle or sometimes disconnecting various sensors to remove the shorted one from the system may permit communication. See what you get if you pull the fuse for the ABS ,anti-lock brake system. It sends a bias voltage to the sensors and if that voltage cannot do what it is supposed to do, it has been known to prevent communication.

 

Thanks for a reply. will give that in morning and let you know . Will that also cause the gauges to fail, tranny to stick on high gear and lose psi on turbo?

 

At certain times and under certain conditions the system is designed to protect itself (the vehicle) and when .one or more of those conditions exist the system will for example allow the vehicle to move so you are not stranded , but also get your attention that something is wrong and requires attention.