Read the lines under table 4-4 in the game manual:
Quote:
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*Multiple low-load, pneumatic solenoid valves, electric solenoids or CUSTOM CIRCUITS may be connected to a single relay module. This would allow one (1) relay module to drive multiple pneumatic actions or multiple CUSTOM CIRCUITS. No other electrical load can be connected to a relay module used in this manner.
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So, if you use a spike instead of the PCM to switch this, no problem.