Originally Posted by Dkahnjob

Once calibrated they are very accurate.

Originally Posted by formula377

I had a set on my previous boat. I have a complete set sitting in the closet if your interested???

My setup had a single gage with a switch you could flip to see what each engine was eating. There was also a digital meter at the bottom of the gage that reads the total amount of fuel used by both engines at all times. There was also a momentary switch to reset the system.

Let me know if you have any other questions?

Originally Posted by Wildman_grafix

Can you hook them into a GPS so that it could calculate m.p.g?

Would seem like a great way to optimize trim on longer runs.