Hi, I swapped in a engine, trans, and t-case along with the ecu ecu from a drive by cable yukon 2500 with a lq4 into a 1999 silverado and when I did the fuel gauge stopped working. Right when you turn the key on it works for a couple of seconds and then it drops down all the way to empty. It is also throwing a few codes like low coolant. Does anyone know if there is anything I can do to fix it, or is it just some sort of incompatibility thing? thanks