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Installation Instructions
P/N 9901 Speedometer Calibration Box For Use With Cyberdyne Speedometers
(for 12 volt negative ground systems)
The Calibration box is a small, easy to install device, that corrects for speedometer reading errors. These errors are the result of different size tire sizes, gear ratio changes or the installation of an after market speedometer. The calibration box will work with most speedometers that are pulse driven with an electronic speed sender.
The Part Number 9901 calibration box is intended to be used with speed senders that have a pulse count of 4000 to 8000 pulses per mile. All Cyberdyne speedometers use approximately 8000 pulses per mile.
Installation
1. As a safety precaution, disconnect the negative (-) battery cable before installation. FAILURE TO OBSERVE THIS PRECAUTION COULD RESULT IN BURNS, ELECTRICAL SHOCK, OR OTHER PERSONAL INJURY.
2. Choose a location inside the vehicle to mount the Calibration box that allows access to the adjustment screws after the installation is complete.
3. The calibration box can be either secured in place with mounting screws or double faced tape.
Electrical Connections
1. The Red Wire: Locate a good 12 V switched positive (+) source such as the accessory terminal in the fuse block or the ignition switch circuit. The 12 V source should not aready be overloaded with accessory.
2. The Black Wire: This is the ground connection. A good ground is very important for proper operation of the calibration box.
Use the following guide.
A. P/N 9901 Calibration Box with Cyberdyne Memory Speedometer with or without ECM. See figure 1.
Connect black wire from 9901 calibration box to the black wire from P/N Memory Speedometer. Also connect the “Lo” (or black) wire from the speedometer sender to this junction.(If your vehicle has an ECM this last step is not required. The sender “Lo” is already properly grounded at the ECM)
Route a piece of 14 Ga. AWG stranded wire from this junction point to the battery negative (-) terminal. The negative (-) battery connection to the body can also be used.
3. The White Wire: This is the calibration box signal input wire. See figure 1. The white wire is normally connected to the (Hi) or white wire for the speedometer sender.
4. The Blue Wire: This is the calibration box output wire. P/N 9901 with A240E??1N
Calibration
It is recommended that the calibration adjustments be done by a professional speedometer shop to ensure optimum performance, accuracy and reliability. If you choose to do the calibration yourself, you will need someone to assist you who has a vehicle with an accurate speedometer as well as a passenger to make adjustments to the calibration box while at speed..
1. Refer to figure 4 for the location of the adjustment screws on the calibration box. Using a small screwdriver, turn both screws counterclockwise until either a slight “click” is felt or until you have turned the screws 10 full rotations. This will set the box to its highest setting. You will adjust the calibration box “down” to its correct level.
2. Have the person in the other vehicle drive in front of your vehicle at a pre-determined pace. The passenger in your vehicle will then turn the “coarse” adjustment screw in a clockwise direction until the proper speed is displayed on your speedometer.
Note: You may experience erratic speedometer readings initially. This is because the range of the box is higher than that of your speedometer. Your speed reading will stabilize as you turn the “coarse” adjustment in a clockwise direction.)
3. You should be able to accurately adjust the speed using only the “coarse” adjust. In the event that you cannot, set the “coarse” adjust to a reading as close to, but higher than, the desired speed. Then turn the “fine” adjust in a clockwise direction to decrease the reading to the desired level.
Troubleshooting
1. Double check all wiring. Make certain all connections are tight.
2. There are many other possibilities for connecting the calibration box. If your application is not covered in these instructions call the factory for more information. 724-258-8440
