It would be trivial (for a programmer) to reprogram a
mpguino to read fuel flow sensor pulses and assign each one a fixed amount of fuel for display purposes. Heck even a bicycle computer can be calibrated to read a fuel sensor and give a meaningful result. Diesel John has been looking at the sensor end of it closely:
mileage computer for a carbureted engine and I haven't come up with anything better.
But I agree that the still functioning zemcos would be best put to service in a carbureted vehicle, at least until something else comes along.