[rotorwrench]

Without being specific, they are telling folks not to trust them. The reproduction meters I see don't hold a candle to an OEM original. There aren't many ammeters made to fit the Ford dash so there are not a lot of choices out there. A person can use a shunt or a shunt wire to protect the ammeter but some calculations have to be done to get the wire length correct for the shunt bypass amount so the meter will have some known indication to go by.