JC Whitney used to carry a cheap one, but I can't find it now. That site only had a too basic description with no mention of fuel return sensors.
Here's an expensive source ( $790)
http://www.wmjmarine.com/950m-201-1k.htmlIt looks like all the cheap ones today use the OBDII connector, we don't have as we don't do computers for our injection.
arb, what are you smoking?
$800 for a fuel gauge is nothing man. I've got my fuel gauge resistor GOLD coated... awww yeeeeaaahhh IT may be in the tank but i know it's there

Edit: I mean platinum coated.. wait ... i don't know how to add up to 800 USD for a simple volume/resistance gauge
arb, what are you smoking?
$800 for a fuel gauge is nothing man. I've got my fuel gauge resistor GOLD coated... awww yeeeeaaahhh IT may be in the tank but i know it's there 
Edit: I mean platinum coated.. wait ... i don't know how to add up to 800 USD for a simple volume/resistance gauge 
LOL !! Thanks Man, I'm just a cheap SOB ;-P
wayy to much for a gauge.
The new opal Diesel's come with one from the factory. It displays MPG when moving, and gallons per hour at idle.
I thought it would be cool.