69 b body standard guages not ralley ,worked fine ,then fuel guage quit ,grounded wire at tank it moved guaged ,got busy didn,t have a chance too r&r ,got in car other day ,now temp guage quit ? i don,t know where to start ,oil pressure is idiot light it still works ,any input would be great ,thanks

I would check the voltage reducer. Take a test lite and put it in the wire to the gas tank,turn key on and if the reducer is good it will blink. You have to start some where and you can check the other gauge th same way. Good Luck