Mercury – Pressure Transducer Kit | 100 PSI SmartCraft Speed Input | 859210A1

Overview

OptiMax engines rely on a steady water-pressure signal to deliver accurate SmartCraft speed readings, and this kit provides exactly that. The Mercury 859210A1 Pressure Transducer Kit gives your engine a clean 100 PSI pressure input by plumbing the sensor to a speed-pickup tube and wiring it directly into the SmartCraft sensor plug. Mounted on the transom bracket or in a nearby hull location, it gives boats running under 80 mph a simple, dependable way to feed pressure-based speed into the SmartCraft network.

Key Features

• 100 PSI Pressure Sensor – Built for water-pressure speed input on boats operating below 80 mph.
• Transom or Hull Mount – Can be mounted on the MerCruiser/OptiMax transom bracket or a hull location near the engine.
• SmartCraft Speed Signal – Provides pressure-based speed data to SmartCraft gauges through the included sensor plug.
• Plumb-and-Wire Design – Sensor connects to a pickup tube and then into the engine harness for clean communication.
• OptiMax Ready – Intended for 2002 and newer OptiMax outboards.
• Durable OEM Construction – Engineered for long-term exposure to vibration, water pressure, and spray.

Compatibility

• 2002+ Mercury OptiMax outboards
• SmartCraft gauge systems
• Boats operating under 80 mph
• Transom or hull-mounted pitot pickup installations

Performance & Practical Benefits

This kit gives OptiMax engines a reliable way to feed SmartCraft speed information without relying on a paddle wheel or GPS. The 100 PSI transducer responds quickly to pressure changes, giving smooth, predictable speed readings throughout your normal running range. Once mounted and plumbed, the signal stays steady, and SmartCraft gauges track speed accurately whether you’re cruising, trimming up, or running through choppy sections.

Why Buy OEM

Speed-pressure sensors live in a harsh environment, and SmartCraft expects precise, stable data. Mercury’s OEM transducer meets those requirements with proper calibration, waterproof connectors, and a housing designed for real-world marine use. Off-brand sensors often drift or clog, causing unreliable readings. The factory kit gives you long-term consistency and dependable SmartCraft communication.

FAQ

Q1: Who is this kit designed for?
Owners of 2002 and newer Mercury OptiMax outboards running SmartCraft gauges and needing a 100 PSI pressure-based speed signal.

Q2: Where should the sensor be mounted?
On the transom bracket or on a clean-water hull location near the engine.

Q3: Does this replace GPS or paddle-wheel sensors?
Yes. It provides its own pressure-based speed signal directly for SmartCraft instruments.

Q4: Will SmartCraft pick up the sensor automatically?
In most cases, yes. Once plumbed and connected, the speed signal appears on compatible gauges.

Q5: Does installation change engine performance?
No. It only adds speed-pressure reporting; it does not affect how the engine runs.