Have a 2013 825i with the digital fuel gauge in the display. When I first turn the key on the gauges cycle and it shows full for a little bit but then goes back to showing completely empty and flashing. Bought a new sender which is an updated parts "looks slightly different than original" and still the same thing. Any thoughts on things to check? Thought I seen a post somewhere where he got both the sender and gauge display replaced to fix the issue? Appreciate any info!!