Classic Instruments® Speed Signal Interface

Classic Instruments® Speed Signal Interface

$208.99 ea
Condition: NEW
Availability:Ordered From Supplier. Estimated Ship Date 05/31/2019 (If Ordered Today)
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
Shipping Note:Standard Delivery

Can't Find your Part?

We'll find it for you. Give us a call at 855.444.6872 and we'll source that discontinued or hard to find part.

Why Choose Us?

No Brokerage or Duties - Canadian Owned & Operated - Shipped from Canada to your Door - Easy to Navigate Website - Access to New, Used & Discontinued Parts - Full Time Staff to Answer your Questions.


Muscle Cars & Classics always recommends professional installation of our products. Buyer assumes risk of damage caused by improper installation.

  • Quality Resto-Mod Part
  • A Great Upgrade For Classic Instruments&reg Gauge Packages
  • Made In USA
  • Classic Instruments&reg Offers A Full 5 Year Warranty On All Orders!

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 and later model 700R4's
  • Two wire pulse signal generator input source
  • Classic Instruments SN96 or SN95
  • One wire ECM signals input source


  • 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

Additional 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 generators

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Years
Ford Deluxe 1939 - 1941
Ford Deluxe 1946 - 1948
Ford F-100 1953 - 1960
Ford F-250 1953 - 1959
Ford F-350 1953 - 1959
Ford F1 1948 - 1952
Ford F2 1948 - 1952
Ford F3 1948 - 1952
Ford F4 1948 - 1952
Ford Ford 1949
Ford Model 18 1932
Ford Model 40 1933 - 1934
Ford Model 48 1935
Ford Model 68 1936
Ford Model 74 1937
Ford Model 78 1937
Ford Model 81 A 1938
Ford Model 82 A 1938
Ford Model B 1932
Ford Mustang 1964 - 1973
Ford Mustang 1979 - 1993
Ford Mustang II 1974 - 1978
Ford Standard 1939 - 1940
Ford Super Deluxe 1941 - 1942
Ford Super Deluxe 1946 - 1948

Write a Review

Your Name:

Your Review:

Note: HTML is not translated!

Rating: Bad Good

Ask a question about

Classic Instruments® Speed Signal Interface:
Your Name:

Your Email:

Question: Note: HTML is not translated!

Related Products
Shipped from Canada
No Brokerage or Duties
Canadian Owned 2019