This is a set of replacement trigger magnets only for the SPA Digital Speedometer (Part No. SPD111) or SPA Speedo/Tacho (Part No. SPCSxxx). Pack of 3 magnets.
Since SPA speedometers are fully programmable, you can use multiple trigger magnets (up to 99!) for greater low-speed accuracy. Be sure to space the magnets evenly around the rotating wheel or shaft. Uneven spacing will make the speedometer oscillate between fast and slow readings. When the magnets are installed, simply program the number of magnets into the speedometer using the "tr" (Set Trigger Points) option on the programming menu.