Navman fuel flow meter.

That's a good price.

I have one installed on my boat (very easy to do), and love it. Dont know why I didnt get one sooner. Much better than just the standard fuel guage.

The meter gives GPH, how much consumed on trip, total consumed over time total (i.e. 2 week vacation in Fla, we burned 268 gallons total), and give remaining gallons in tank. The alarm feature is nice too, I've got mine set to buzz at me when I get to 70 gallons in the tank, that's when I know it's time to head back in with my safety margin factored in.

Very handy!!