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STEP 5: If you need to change the time settings of the outputs, scroll down to AU1 or AU2 on the
OP500. LCD Line 2 is the timed output. Note: with an OP500 update v.31
(https://install.myfirstech.com) you will now be able to allow for timed AUX outputs of up
to 15 minutes.
STEP 6: Hold the “W” Write button for 3 seconds to save all the options.
Tach Sensing
The default engine sensing mode is tach. In cold weather climates we recommend using an injector wire or
tach signal provided by a compatible interface module for tachometer sense. IMPORTANT: The remotes
must be coded prior to programming tach. Firstech recommends using a digital multimeter when testing for
tach.
STEP 1: Start the vehicle with the key. Allow time for the engine to idle down. (If you do not want to wait
for the vehicle to idle down, you can shift the vehicle into reverse while holding your foot on the
brake.)
STEP 2: Test wire and make connection. At idle, the tach wire should test between 1 to 4 Volts AC. As
the vehicle RPM’s increase the voltage on the meter will also increase. Always make a wire-to-
wire connection for tach.
STEP 3: Learn tach: Start the vehicle, hold the foot brake, and activate the remote start by holding the
Start Button for 3 seconds. The parking lights will flash once, and the siren will chirp once to
confirm a good tach signal. If the parking lights flash 2 times and the sirens chirps twice, this
indicates the tach did not learn. A few seconds after the 2 flashes, the CMX will flash parking
lights to indicate the tach learn error.
“EZ TACH” programming procedure
This feature does not require a Firstech remote or Drone to program tach
STEP 1: Hold the foot brake (must be held down before vehicle is on)
STEP 2: Start the vehicle (with foot brake still held down)
STEP 3: Wait 30 seconds (with foot brake still held down) for the CM to capture the engine running
tach signal. The CM will flash the parking lights 1 time after 30 seconds to indicate it has
captured a good tach or engine running signal. If there is no or poor signal the CM will flash
the standard tach programming diagnostics as shown above.
STEP 4: Programming complete (This procedure will be disabled after the first time but will available
if the CM is power cycled)
# of Parking
Light
Flashes
T
ach
Error
2 + 1
Option 2-10 is not in default setting
1
2 + 2
Key
is in the off
position
2 + 3 Bad tach signal. Find a different wire.
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