Then two red fuel low level lights unexpectedly illuminate.
Tandem - LOW FUEL 2 comes on first, followed a few minutes later by LOW FUEL 1.
Any experienced 135 pilot would notice IMHO if the fuel level looked significantly wrong after 1.6hrs airborne.
looking for an IMMEDIATE (and I MEAN immediate) landing. I would also be mentally preparing myself to dump the lever at the slightest cough from the running engine.
Same here