Python Responder LC Model 991, Руководство по установке

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Tach learning
To learn the tach signal:
1. Start the vehicle with the key.
2. Within 5 seconds, press and hold the Valet/Program
switch.
3. After 3 seconds the LED lights constant when the tach
signal is learned.
4. Release the Valet/Program switch.
Tach threshold On/Off
In most cases, this jumper can be left in the Off position. Some new vehicles use
less than 12 volts in their ignition systems. The unit may have trouble learning the
tach signal in these vehicles. Changing the jumper to the On setting changes
the trigger threshold of the digital tach circuit so that it works with these type
vehicles.