I recently started trading ES ...
I have been watching the NQ as well, however in found this more distracting instead of being helpful.
I get all my signals from ES, but like to watch NQ and the NYSE TICK for support.
Generally, for a strong move, you'd want participation among all the indices. If ES is making a new high, but NQ is well below the HOD, I'd be very cautious and look for ES to print a top. Or if you want to short the ES, but NQ is picking up upside momentum - be careful.
The TICK can offer come clues too.
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