Suddenly on my 2015 Monte Carlo with the analogue fuel gauge has gone weird. Today it was showing just above the Red but the fuel light was not on yet.I put in just £5 ( yeah i know but its middle of the month) and the needle hasn,t moved from where it was.Tonight again i thought i would just put in another £5 and still the needle stayed put just above the Red but as i was driving its very slowly beginning to creep up. Before this happened if i put £5 in it used to instantly go up at least 3 lines on the gauge yet now this happens. Any ideas please? Sudden faulty fuel sender? Disconnect battery for a while and reconnect to see if it resets everything?