I would not feel comfortable with a pegging ammeter. Check to see if the wires get hot when it pegs. how is your volt meter wired? If all is cool, then un-peg your gauge one last time, then don't run current through it anymore. You can put all of the wires which are currently on the ammeter posts on on post while leaving the other post without any wires. Current will then go where it needs to go without going through the ammeter and your gauge will look right.
