Sense off-idle and switch accordingly?

Points
67
Location
Topeka, Kansas, USA
Car
1998 Chevy Tahoe
I have some electrical widgetry I'd like to switch on progressively, starting with off-idle status. Stage 1 is turned on at ignition, stage 2 is to be added at off-idle, then stage 2 gets turned off when back to idle. What's the simplest way to do this for the general automotive case?
 

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