68 Barracuda........ Temp and Gas Gauge Issue.

Looks like they are working. Temp is a slightly high and oil is a bit low in my eye. Not to worry since these are within the range of a range indicator.
Gasoline... 80 ohms is no needle movement. Needle at off/home would be on top of the 'E'.
73 ohms is the first hash mark or more correctly the target dot above that hash mark. Approx' 3 gallons of fuel, while sitting level, should get the needle close to the target. Instrument age and other factors determine how well it works and how long it will work. Good luck with it.