Cummins Diesel Truck Erratic Speedometer and Shifting

we can't guess rips
but glow plugs dead ?

check for seized turbo blade actuator , rotten hoses or solenoid problem for turbo
run fault codes

speed sensor failure

Symptoms of a P0500 DTC may include
: loss of anti-lock brakes the "anti-lock" or "brake" warning lamps on the dash may be lit the speedometer or odometer may not work properly (or at all) your vehicle's RPM limiter may be decreased the shifting of an automatic transmission may become erratic other symptoms may also be present

Read more at: https://www.obd-codes.com/p0500
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Dodge Cummins Error Codes List - Diesel Bombers

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Apr 6, 2009 - It appears to have every CEL code known to man... or at least known to Dodge. ... Chevy/GMC Truck and Duramax Turbo Diesel Forum · Chevy/GMC Duramax... General · 2011 · 2013+ · 2007.5 - 2012 LMM · 2006 - 2007 LBZ .... P0039 Turbo/Super Charger Bypass Valve Control Circuit Range/Performance

try ( allpar.com )

have the shift solenoid checked out
Auto Zone will perform a free scan of the computer to dee which one is at fault

Yes your speedometer, and odometer are controlled by your speed sensor.

I had the same problem on a 94 dodge with the cummins. It seems the crank sensor that reads from a notch on the harmonic balancer was the problem Without this sensor reading that the engine is running the alternator wont charge. Possibly the same problem with yours

check fuse #9 in the fuse box for being blown or lacking power...if there is no power to the fuse it is possible the ignition switch is bad

The cruise control on y 1997 dodge cummins diesel 4x4 suddenly stopped working.I checked the fuses but they are ok.any solutions?