Re: Check gauge
The Check Gage info is in the owner's manual. Lots of other useful stuff including specific instructions on the correct way to check the transmission fluid level.
If you don't have an owners manual, you can use the link in my signature to download the .pdf file.
As far as fuel level goes, Ford gives you roughly 50~60 miles notice before empty with its low fuel indicators. That corresponds to about 3~3.5 gallons in a Ranger.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid