If you connect a tachometer signal to COMPUSHIFT II (recommended), you need to tell COMPUSHIFT II how many times per engine revolution your tachometer signal fires. The frequency of this signal varies depending on the number and arrangement of engine cylinders.
The following table shows the usual relationship between engine type and pulses per revolution (PPR) for different types of gas engines:
Tachometer Pulses Per Revolution
V6 or Inline 6
You should check with your ignition, engine, or vehicle vendor to confirm this setting.