I have an 02 LS430 that needed the fuel pump replaced. After changing the pump the fuel gauge is not working. It is an aftermarket pump but it's the full module with sending unit.. not sure if this true but someone mentioned having to calibrate the new pump. Does anyone have some input on this? I have techstream set up on my laptop but need a new battery so I haven't had a chance to check it out. Car starts and runs fine but no fuel gauge.