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its on the bottom right of the dash on the 172, ive never seen it come on in my uncles cos he never goes above 5000rpm. but its on wen u switch the ignition on
Its not an optimum changer indicator, it just comes on either 250 or 500 rpm before the rev limiter cuts in, nowhere near optimum, just look at a torque graph from a 172/cup and then find the change points
The only ya going to be hittin the limiter is to hang on balancing it through bends where a gearchange could throw the cars balance off, or on the drag strip where you lose time unless you change early enough to make it count.