I replaced my ECM last week due to multiple issues of it shorting randomly shutting the truck down with code P0606 and P1680. After I replaced the ECM, the truck seems to be running much better and haven't had any issues with the truck stalling. I got the ECM from a junk yard, and the only issue I am noticing is that the gas gauge is working backwards. When the tank is full it reads empty, and moves backwards. Is this a sign that the junk yard ECM is going bad also. I only got it from the junk yard because I needed one now. Just wondering if I should go ahead and order a re-manufactured one online, or just deal with the backwards gas gauge function.