Fuel Gauge Year Breakdown

[thefraze_1020]

Ok, so I've read several threads and write-ups about how do tell the difference between tachometers and speedometers from various years, but can anyone shed some light on fuel gauges?

I know the difference between 73-79, and 80-87 (91) fonts, but I've seen some with "E" and "F", tank symbols, some with "unleaded fuel only", "diesel fuel only", or just "diesel", or just blank.

Is there a rhyme or reason to these variations (by year, model, etc)?