You make me think it is a grounding issue because it happens right after I start it up. The ignition gets power, the gage reads in the range I expect, but at idle it acts a little nervous, swinging around a ±1/8 tank range (1/4 tank total.) I need to be more observant when I power up, but before starting.

I doubt there is that much slosh at idle. I can imagine the gas surface dancing a bit, but not sloshing around until I get it in gear.

Thanks for the confirmation- time to look at grounds.

Bill