rtbcomp
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..........The only thing you need to make sure is that the pressures are OK - if you have one compressor that's only supposed to go up to 120 psi and the other to 150, make sure you drop the 150 down to 120 otherwise, at best, that one will do most of the work and at worst it'll be too much pressure for the other one.
You can put a non-return valve on the lower pressure compressor to protect it from the higher pressure generated by the other.
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I would typically aim to have both compressors set to go on and off at the same pressures.
You don't actually want them to both kick in at the same moment, but in practice no amount of fine tuning is going to make them come on at the exact same second.
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I've set mine about 15psi (nominally) apart, the pressure switches aren't that consistent and I find that a 15 psi on pressure gives a good safety margin.