I installed a new dakota gauge set and got everything working (except) my gas gauge. My sending unit was working before so need to figure where the problem lies. I thought I wired it correctly but was not working, so in order not to pull the dash. I cut the tan wire below the dash and tied it into the control box, But nothing.So lets say I disconnect it from the control box. Should it ohm by touching one lead to the tan wire and the other to any ground?