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The links in this thread show the the tach signal comes from other than the CPS in later model 7.3's. But if your 7.3 just quits cold for no apparent reason it is a good guess that it is the cps. It should throw a code for those with code readers. Mine has thrown out a code a couple of times but still hangs in there. It threw it while climbing and near the top of mountain grade while the transmission shifted.
Worst case would be on mountain descent while towing. You will have your hands full to safely make it to the bottom. I would hope for one of the runaway ramps for stopping and replace the cps on the spot and continue.
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