Turbine spinner has Hall Effect magnet embedded so you want to avoid placing pump and/or solenoid in the magnetic field direction (perpendicular to rotating axis). Place them at least 2-3 inches in front/aft or as far away as possible. Pump/Solenoid should not be adjacent to the TEMS & Rx and should be at least 3 inches away. Best way is to test the system with your planned installation. Yellow F-15 has ample of space so avoid crowding the components. The installation may look neat but may cause lots of interference during operation.