Let me start this off with an apology to the 'purists'...(that I would LOVE to put in tiny font...
)
I HAVE A RADIO IN MY COBRA...aaaaaaaaaaaaaaaaaaagh
Now, with that mea culpa out of the way, here's the problem...
When I turn the radio up loud (is there any other way to hear the damn thing...lol), the fuel gauge needle swings across the gauge in beat with the bass of whatever is playing!
The fuel sender doesn't share a common earth with the radio, so I can think of only two reasons (and I have checked both!!!)...
1) Their is induction/interference across the speaker wire and it is close to either the fuel sender wire, OR the fuel gauge ground
or
2) the radio and the fuel gauge share a common ground and I am getting induction/interference this way.
any suggestions, observations or insights would be appreciated
Glyn