"Ken Heaton" wrote in
news:J3Mle.13142$HI.6104@edtnps84:

Gas gauges would often not
give a true reading of tank level until you started the motor and the
alternator kicked in. Again, I'm not sure if boat gauges are wired this
way.


Of course, we all know how DEAD ACCURATE those wonderful BOAT gas guages
monitor the fuel supply that can strand you miles from nowhere.

When my Sea Ray read 1/2 full, it meant you used 6.5 of the 25 gallon tank.
When it read empty, you had used 9.5 gallons of the 25 gallon tank. When
it read below empty, you simply opened the "trunk" and leaned down into the
bilge so you could see the fuel level in the stern end of the cheap
polyethelene tank supported by two little plastic brackets digging into the
milk jug material 25 gallons of fuel were waiting in to blow you all to
hell if it leaked. It's nice-looking Sea Ray gas guage was damned near
useless....

The tach seemed to work....