82181 7000RPM Stewart Warner Tacho | Genuine Used Part

🔧 Product Description

Genuine Stewart-Warner Deluxe Sidewinder 0-8000 RPM Tachometer - Part Number: 82181

A genuine used Stewart-Warner Deluxe Sidewinder electrical tachometer for compatible 12-volt petrol ignition systems.

Although commonly described in used listings as a 7000 RPM tachometer, Stewart-Warner part 82181 carries a 0-8000 RPM scale. The 3-3/8-inch instrument has a black face, white numerals and pointer, and polished bezel.

⚙️ Key Features

• Genuine Stewart-Warner Deluxe Sidewinder tachometer
• Correct Stewart-Warner part number 82181
• Official 0-8000 RPM scale
• Approximately 3-3/8-inch electrical instrument
• Designed for compatible 12-volt petrol ignition signals

🚤 Compatibility

Commonly used on

• 12-volt petrol marine, automotive and industrial ignition systems
• Boat dashboards using a compatible ignition-coil or tach-adaptor signal

Typically suits

• Engine models:
• Petrol inboard and sterndrive engines with a supported conventional ignition tachometer output
• Outboard installations fitted with a compatible tachometer adaptor or pulse interface
• Four-, six- and eight-cylinder petrol applications only when the tachometer configuration matches the ignition signal
• HP Range: Not engine-specific
• Engine Type: 12-volt petrol ignition system
• Year Range: Application and ignition-system controlled

🔌 Function

The tachometer counts ignition pulses and displays crankshaft speed in revolutions per minute. A compatible signal source and correct calibration are required, particularly when electronic ignition or an aftermarket control module is fitted.

⚠️ Common Signs of Failure

• Tachometer remains at zero
• RPM reading is incorrect for the actual engine speed
• Needle fluctuates because of ignition noise or poor grounding
• A tach adaptor is required but missing
• Internal movement or illumination fails

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 82181 current known Stewart-Warner Deluxe tachometer reference

OEM / Related Numbers

• 82181
• Stewart-Warner Deluxe Sidewinder tachometer
• 0-8000 RPM electrical tachometer
• 3-3/8-inch instrument class

Aftermarket / Verified Equivalents

• Stewart-Warner: 82171 - Heavy Duty 0-8000 RPM functional alternative
• Veethree: 84293FE - Premier Pro 0-7000 RPM functional alternative

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated