MPL 503 Series pressure sensor switch activates at 42 knots.
The accuracy and reliability offer an excellent general purpose low pressure to electric interface for monitoring and control applications.
The miniature size make the 503 Series ideal for OEM applications.
Setting: Normally open. Activates at 42 knots.
This seems to fit the bill for a homebuilt Velocity retract system were building. The unit appears to actuate around 50kts and has male tab terminals which make for easy wiring. The four holes make mounting a snap.
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Per the vendor it is set to .5" to 3" in water.