[EricH]

Originally Posted by Kat Kononov

I have a sort of related question: Am I allowed to wire two solenoids to the same spike relay if I need the two solenoids to act simultaneously?
I know the rules say I have to wire each electrical load to one Spike/Victor, but can I wire multiple loads to the same spike?

Yep

<R56> Each power regulating device (Victor speed controller or Spike relay) shall control one and only one electrical load (motor, actuator or compressor). Multiple low-load devices (e.g. pneumatic valves) may be connected to relay modules (but only one motor may be connected to each relay module).

There is also no rule about how many PWM Y-cables you can use. One Y-end to each spike (up to two) and the single end to the PWM output on the RC, and you're good.