[reelapeelin]

Zebra...you are "grounding" two seperate things; FIRST you are grounding the fuel GAUGE.....SECOND you are grounding the fuel TANK...

Grounding the gauge, of course, allows the gauge to operate...it should be grounded to a "central" or "common" ground where any number of your boat's other (tach, radio, depth-finder, etc.) electrical components are grounded...if you wanna, you can ground directly to the neg. post on your battery, but it's not needed...

Grounding the TANK keeps Zebra from goin' POOF while fuelin' his boat...while you are fuelin' your boat, the gas goin' in displaces the fuel vapors commin' out...slightest static spark from nozzle arching to fuel-filler fitting and, as mentioned above...Zebra go POOF... plastic (vinyl) will create a static discharge QUICKER than metal...

SO...your tank should have three (3) wires attached to the top of it; POS to the POS on the back of the gauge; NEG to the NEG on the back of the gauge; AND "GROUND" which runs from the tank itself directly to the underside of the fuel-filler fitting...

Hope this helps... ;) ;D...