Shutdowns due to 'crankcase sensor too high'

Is the crankcase pressure sensor used to provide the "pressure" on my 'oil can' dash meter.

Or is it some other sensor?

I've had two shutdown's due to 'crankcase sensor to high' this morning.

 

Had it serviced at Roberts truck center in Savannah, GA Tuesday.

It was 'just' the sensor.

I did however, get a chance to have my #1 pos EGR valve replaced with a reman'd unit. $690.

Here's where it gets strange. Leaving last night, I did an all night run north on 77 to get to Cleveland by 2pm today.
Climbing out of VA into WV, my check engine light comes back on(arghh)

My Oil pressure guage on dash now reads 0.(this was replaced last year)

Engine ECU diagnostic says its a communications error.
Instrument ECU says electrical fault.

Which begs this question. Do i have an issue with an electric surge that may be popping/blowing out sensor's?

 

interesting...where can I look to see if it needs to be plugged in properly.

I cleared the codes( don't remember what codes were).... and none have popped since...and oil can is still reading zero.

 

?? the crankcase pressure sensor and oil pressure sensor are stacked vertically on engine block just behind alternator on left hand side??

which is which- both are tuf to reach behind the tangle of wiring harnesses.

Both appeared to have plenty of 'designed' play both clockwise and counter-

On ignition key sequence start: 'oil can' pops from dead(below zero) to zero precisely.

On LCD diagnostics, engine oil show 'full' 8 qts