Had my 98 XJ die on me on street today. Engine had been running smooth with no problems starting. The only issue I noticed is my temp gauge would get just a little above 210 but no higher and the oil pressure gauge would furiously from 40 psi at idle down to 20 psi and fluctuate back and forth. It only did it once engine was at operating temp. Suspect it’s oil send unit. After it died it would crank over but not start. If the send unit failed would it cause engine to die and not start?