GMPP E-Rod Fans and A/C

[longhornss]

Guys I currently have two Project cars in the shop with the 425 HP E-Rod package in them (ECM 19257232)

The fuse panel is only wired for one fan but both projects are using two.
The fan relay is being triggered by two wires from the ECM. I know that the blue and green wire coming from C1 54 and C3 49 respectively in the ECM are what are triggering the fan felay.
In the fuse box the blue and green wires are connected together. Can I separate these two at the (fan one) relay and simply wire in an additional relay for fan two? Green Trigger to one relay and blue trigger to the other?

Also is there a way to wire up the fan circuit to an aftermarket a/c (Vintage Air) trinary/binary pressure switch so that the fans come on when the A/C requires it? I am thinking just use the ground side of the trinary and wire it parallel with the ECM triggers?

[longhornss]

Does this sound right to anyone or am I off base here?