1997 freightliner classic dies

1997 classic 12.7 series 60 temperature gauge goes to 250 dash cel,stop engine light I lose throttle and it dies.
I have changed both sending units, sent ecm ( dedicated 4) out and they said battery on board ng and changed, I changed the Kyser module, I have traced all the coolant wires into the harness. I unplugged the throttle no change. I had the codes red it shoes a overheat sensor. I'm just lost..
Any help or susjestions???

 

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The gauge clicks up to 250 dash cel lights light up loose throttle and it dies. It is sometimes hard to restart.

 

No it does this from the moment I start it cold

 

I tested voltage and ground on both coolant senders I don't have a skamatic to look at.

 

Yes it's a kysor and I replacer it...along with a new sender