SPEEDO/TACH INTERFACE MODULE

Brand New Classic Instruments Speed Signal Interface (Part #SN74Z).

The Classic Instruments Speed Signal Interface has state of the art signal averaging software that ensures smooth pointer operation, even in fluctuating signal conditions. Noise-reducing, filtered power output helps for powered speedometer signal generators. Input signals can range anywhere from 2000-200,000 pulses per mile. This unit converts VSS/ECM speed signals to either 8k or 16k PPM.

Features:

• As a Speedometer Interface:
  
  • Three wire pulse signal generator input source
  • Built-in Vehicle Speed Sensor (VSS) input source
  • Most Tremec transmissions
  • Later model 700R4’s        
  • Typically a sine wave signal
  • Two wire pulse signal generator input source
  • Classic Instruments SN96 or SN95
  • Typically a sine wave signal
  • One wire ECM signals input source
  • Typically a 5 volt square wave
  • The output can be selectable between either 8000 pulse per mile or 16000 pulse per mile
  • Outputs a 12V square wave, 50% duty cycle
  • 8000 pulse per mile cruise control output
• As a Tachometer Interface:
  • High Voltage Coil signal input source
  • .5-6 pulses per revolution (1-12 cylinder engine)
    
  • Typically the negative side of an ignition coil
    
  • 5-12V Square Wave signal input source
    
  • .5-6 pulses per revolution (1-12 cylinder engine)
    
  • 20%-50% duty cycle
    
  • Typically from an electronic ignition box or computer
    
  • Inductive Gear tooth sensor input source
    
  • Can be used with 32-510 tooth flywheels, 32-510 pulses per revolution
    
  • 12V square wave, 50% duty cycle
    
  • 2, 3, or 4 pulses per revolution (4, 6, or 8 cylinder)
    
  • 3 preset flywheel tooth settings
    
  • 148 tooth – Chevy Duramax
    
  • 152 tooth – 5.9L Cummins
    
  • 155 tooth – 7.3L Ford Powerstroke

You can view and download the assembly/instruction booklet here.