MANUAL # 650324
STM-100
Data Bus Breakout for 2004
– 2010 Harley Davidson models
The STM-100 can be used to simplify the installation of an aftermarket speedometer and/or
tachometer on a 2004
– 2010 Harley Davidson motorcycle. The device converts the signals from the
data bus into traditional analog signals for a gauge of your choice. Outputs are provided for accessory
power and ground, tachometer signal (adjustable for 1, 2 or 4 cylinder outputs), speedometer signal
(8,000ppm) in addition to the Check Engine signal, normally only available on the data bus. The STM-
100 plugs directly into the diagnostics port and reads the signals from the ECM so there are no additional
sensors to wire.
In addition to the wired outputs, the STM-100 has an LED display that allows you to read and
clear diagnostic trouble codes, similar to a scan tool.
Included in the kit you should find:
WIRING
Locate the four-pin diagnostic plug, typically found under the seat or side cover near the ECM.
The STM-100 will plug directly into the diagnostic plug. This will provide the power, ground, and data
into the STM-100.
*** Note: If you ever need to perform diagnostics or re-flash an ECM at a shop or dealer, unplug the STM-
100 to gain access to the diagnostic plug, after the work has been performed simply reconnect the STM-
100 to the diagnostic plug. All of your previous settings in the STM-100 are saved, so removing or
unplugging will not affect the setup.
STM-100
Heat Shrink
Power Harness
Signal Harness
Manual
