Supplementary Instructions for Wiring Smiths Electronic Instruments
Download the complete PDF version using the green download button at the top right of this page for a detailed wiring supplement covering the installation of Smiths electronic speedometer and tachometer instruments. Written by Derek Wilson, this resource explains the required connectors, wiring supplies, hand tools, crimping method and connection layout needed when preparing a clean and reliable electronic instrument installation.
The guide provides practical information on the AMP-style connectors used for the instrument wiring, including the required 2-pin, 3-pin and 4-pin connector arrangements, along with recommended supporting supplies such as wire, crimp terminals, Lucas-style bullet connectors, a 3A fuse holder, heat shrink tubing, solder, tape and cable ties. It also explains how to correctly fit the small wire seals and pins, how to use the stepped-jaw crimpers and how to confirm that the terminals are properly locked into the connector housings.
The final pages include clear speedometer and tachometer wiring diagrams showing connector positions, wire colors, fused power feeds, main harness connections, speed sensor wiring, momentary handlebar switch wiring and the switched ignition coil signal for the tachometer. This makes the document a useful companion for owners upgrading or troubleshooting electronic Smiths instruments on a classic motorcycle.
Contents Include
- Smiths electronic instrument wiring overview
- Required 2-pin, 3-pin and 4-pin connector types
- Recommended wiring supplies and workshop tools
- Crimp pin and wire seal installation guidance
- Using stepped-jaw crimpers correctly
- Connector pin locking and removal notes
- Speedometer wiring diagram
- Tachometer wiring diagram
- 3A fused power connection reference
- Speed drive sensor and handlebar switch wiring
