Those photo's appear to be the Tach's. If they have two wires and four brushes, that is not the resolvers.
These are resolvers, ebay item 120350841073.
RES/IND is the Resolver/Inductozyn board.
If you can identify which axis is which, you should be able to transfer swop the plugs over to see if the alrm number changes to a different axis.
IIRC, the centre digit (x) is the axis, 4x4.
Al.