I am a firm believer in cause/effect. Did it work fine before you changed the circuit board?I recently replaced the flex circuit on the back of my center console. Now all my gauges work except for the gas gauge. Sometimes it will be on empty, and others at half. Thats it. Doesnt matter how much gas is in it, it will only go to those two. Could it be something with the circuit or is there a sensor in the gas tank?