Hey Nacho,

I recently came across the ammeter sizing description on the Jamestown Dist website but I see you already are familiar with that.
That's a great picture in the FBBO thread. Interesting it has a capacitor. Do you have a picture of its circuit board connections.

Also interesting is that some ammeters do not have shunts. Probably cheaper although more limited.
http://www.triumphexp.com/phorum/read.php?17,1078873

For anyone more interested in how they work, the math and diagrams for shunt ammeters here:
http://www.tpub.com/neets/book3/7g.htm

Its possible that when Chrysler went to a external shunt meter, they weren't too concerned about the shunt resistance. They assumed it was in some range based on plain wire. The heavy resistor in-line with the meter movement was the key to it being approximately 60 amps at full scale.

Did you ever get a picture of the back of the 80 amp ammeter age?