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Vehicle Info NeededCLASSIC INSTRUMENTSPART NUMBER: 087-SN74Z
Signal Converter Universal
$15895
Ships on 09/04/2026
Lowest Price GuaranteeUniversal
- Signal Converter
- Universal
- 8,000 or 16,000 ppm
Converts VSS/ECM speed signals.The SN74Z has the following features when used as a Speedometer interface.
Input Source Options: - 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 waveOutput: 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 outputAdditional Benefits: Three different calibration options
- Instant: drive 30 MPH and press the calibration button
- Real-Time: press and the hold the calibration button to match the speedometer reading to the actual vehicle speed
- Marked Mile: Drive a measured mile to calibrate the speedometer
- Input signal can range from 2000-200,000 pulses per mile
- State of the art signal averaging software that ensures smooth pointer operation, even in fluctuating signal conditions.
- Noise-reducing, filtered power output for powered speedometer signal generatorsThe SN74Z has the following features when used as a Tachometer interface.
Input Source Options: - 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
- Typically used in diesel applications where there is not an ignition system
- The sensor can be mounted to the engine near the flywheel to sense the gear teeth as they rotate by
- Can be used with 32-510 tooth flywheels, 32-510 pulses per revolutionOutput:
- Signal output
- 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
Part TypeSpeedometer Sender
BrandCLASSIC INSTRUMENTS
Package Height2.3
Package Width3.3
Package Length5.9
Weight0.34 PG
Part CategoryReplacement Parts
Vendor Part NumberSN74Z
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
