The only official answer is the Q&A, but I would point you to R85 and R86:
Quote:
R85. If the compressor is not included on the ROBOT (under the provisions of Rule R79), the “Working” Pressure Regulator, ”Stored” Pressure Gauge, and pressure switch may be located on-board (Figure 4- 16) or off-board (Figure 4-17) (but must be together), provided all other pneumatic rules are satisfied.
R86. If the regulator is kept off-board the ROBOT with the compressor, then only low-pressure (60 psi or less) “working” air can be stored on the ROBOT. The “working” pressure gauge must be installed on-board the ROBOT at all times (Figure 4-17).
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Personally, I think that very clearly states which components can be located off-board, and that does not include the spike. From a safety standpoint, I personally would want to see the spike included on board, so you don't have a pair of live wires dangling off the robot where they could potentially short out and pop the breaker on your PD repeatedly during a match.