Interesting, taken directly from 70 FSM
While FSMs are the most complete and accurate source of technical information for these cars, they still contain some flaws and omissions. Some diagrams have that labeling reversed. Dark blue with a trace is in fact ignition 1, power in the run only position. Brown is ignition 2, the ballast resistor by-pass, power in the crank only position. In the 1970 FSM the diagram for the E-body Rallye cluster is incorrectly labeled while the diagram for the standard cluster is correct. Same switch is used on other platforms, a few diagrams for B-bodies also have them reversed.
'70 FSM e-body standard cluster;
'70 FSM E-body Rallye cluster;