As far as the sweep is concerned I have found when I burnt my clutch that unless the engine meets certain parameters when it first starts (for my car it was a idle rpm) the gauges will not sweep. For example when I went to start it in gear with my stuck clutch the car would start, however the gauges would not sweep.
There is something in the ECM that has to be met in order for it to send out the sweep command, and I believe this is probably a good strong idle.
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