MSD 2350 Pump Booster Wiring Help
 

I bought it used a while back and finally getting around to installing it along with the Racetronix harness. I've got the red wire coming from the relay plugged into the fused orange wire of the booster and the red output wire from the booster plugged into the downstream red wire going to the pump (which I believe is correct per MSD's instructions). What am I supposed to do with the two black wires coming out of the booster since I am using the Racetronix harness? Just run these to a common ground?

I've got that already but the schematic is for direct wiring to the pump. It's not completely clear on what to do with the black wires since I'm using the Racetronix harness (which plugs into the red wires).