A level sending unit is such a simple piece, I doubt there will be a mass of problems with it, like some are suggesting. In reality, what percentage of fuel sending units actually go bad? The pumps die before a variable resistor does.. Of the things to measure on a guage, I have no complaint at oil level. You don't pop your radiator cap to check coolant temp do you?
For an older car, like my Chevy that burns a quart a month (or leaks, it's a Ninja in that regard) a guage in the truck would be handy, to say the least.
