Hey guys son and freind did some work on my gn, changed gas tank, fuel pump, fuel lines, added hot wire kit for pump, then changed heater core as it had a leak. I went to fill car up and found gas guage not working, grrrr, also turbo boost light and tach light, light up when I turn key on but go out when engine starts. I imagine I'll have to pull tank down but have NO idea on guages, idea's?????????????