[bestgenman]

The analog AC ammeters are current transformer driven, these are sometimes called "donuts".  The CTs are located in the circuit breaker panel at the rear of the coach.  The standard ratio for CTs is 5 amperes on the secondary with the primary varying depending on the  current carried.  For example, 100:5,  one hundred amps on the wire in the center of the CT results in 5 amp on the small secondary leads.  The meter is 5 ampere full scale and the face plate is respective of the primary CT ratio.  Newell doesn't use the standard 5 amp secondary (at least not on 567) instead, it is an unknown ratio.

With all due respect Richard, i don't think they are Hall effect.  When the main breaker is opened the current flow stops so the meters drop to zero.

I wanted to read KWs which required a complete meter change as well as CTs.  I selected a Crompton digital product, changed the CTs, & used the voltmeter leads (which also originate in the panel and are fused).  The "plexiglass" strip holding the analog meters needed to be replaced since this digital replaced four meters.  It's not as convenient since scrolling is required the view the individual voltages and currents but it does display one voltage, an average current , & kilowatts in one of the scroll positions (all three).  That was the objective.