Dakota Digital HDX-88C-PU User manual

Manual # 650619
HDX-88C-PU
Dakota Digital HDX Instrument Installation
For 1988-94 Chevrolet/GMC Full-Size Pickup
Your new HDX-88C-PU kit includes:
Installation
Control Box
Main Harness
Universal Sender
Pack
Installation Manuals
HDX Display
Buzzer
1. The first step is to remove the
stock gauge cluster from the dash.
Cut Template
and Cut Guard
Alternator Load Harness
(Used with 3 wire alternators)

Manual # 650619
1a. Remove the plastic cover under the steering
column to access the mounts, drop the
column by removing the two bolts shown in
picture, also slide the gear indicator clip off
the column.
1b. The front plastic face needs to be removed, this is done by removing the (4) four Torx T20
screws and disconnecting the headlight and dimmer connectors.
1c. By removing the vent tube on the left and the heater and stereo controls on the right, you will
have better access to remove the (4) four screws securing the cluster. Finally, remove the
gauge cluster and disconnect the harness.

Manual # 650619
3. Connect the provided harness and the buzzer (optional for audio feedback) to the back of the
HDX system. Carefully route the other ends to the control box mounting location.
Buzzer Connector
2. At your own discretion, use the supplied aluminum template\cut guard to open up the inner structure
to allow more length on the harness side for the required cut and splice wiring. Also, the harness
connector will need to be pushed back to clear the HDX cluster; opening up the inner structure will
allow space needed for it to clear otherwise, the connector will need to be removed.
Remove the connector clip
Outline cut template
Use locking pliers to hold the cut
guard into place to protect the
harness from damage while
cutting the inner structure

Manual # 650619
WARNING: This product can expose you to chemicals including lead, which is known to the State of
California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov
5. Stock 3-Wire alternators will need an additional wiring connection at the gauge cluster connecter.
You will need to add resistance from the Pink/Black wire in the A10 location to the Brown wire in
the A3 location. The range needed is 500-30 ohms, three 1/4W 1K resistors in parallel will be in
range at 333 ohms. The provided alternator load harness can be used to achieve this.
4. Refer to the main manual for wiring instructions and re-install the cluster in reverse order using all
stock hardware to complete the HDX installation.