I need some help with my fuel gauge. I was told by a repair shop that looked at my ski that my sending unit was bad. I pulled it and checked the ohm reading and it was good, between 90.4 and 2.2. I hooked it up with the baffel out and tilted it but got no response on the gauge. I had the key plugged in, but does it need to be running for the gauge to work. Now there is not much gass in it, maybe an inch or two, but the gauge doesn't budge when I run it. Let me know what you think.