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Preparing for Your Installation

Take the time now to plan your installation – it will save you more time down the road!

Engine Preparation

When you ordered COMPUSHIFT II, you had to choose from one (1) of three (3) Throttle Position Sensor (TPS) systems:

  1. The AccuLink TPS for vehicles with Edelbrock AFB, Holley and Rochester Quadrajet carburetors; or
  2. A wiring harness for Electronic Fuel Injection (EFI) vehicles that have their own TPS; or
  3. A Cable Operated TPS for all other engines, including older diesel engines

NOTE: Please contact your distributor or HGM headquarters right away if you're missing the required part(s) for your specific TPS system. Before starting, we highly recommend reading all of these instructions. Think through and plan your approach. It will pay off!

Failure to follow all instructions may cause damage to COMPUSHIFT II, void its warranty, or damage to your vehicle.

Transmission Preparation

COMPUSHIFT II cannot properly operate a malfunctioning transmission, and a malfunctioning transmission may damage COMPUSHIFT II and void your warranty.

Your transmission must be properly installed and in good mechanical condition before using COMPUSHIFT II. A qualified transmission repair shop can inspect, clean, install and/or rebuild your transmission as required. If there are any questions about the condition or type of transmission, please contact a qualified transmission repair facility, HGM Headquarters, or one of our distributors for a recommendation.

Find your transmission from the list below and review these specific tips:

Additional Planning

Prior to installation, you'll also need to decide:

  • Where to mount your COMPUSHIFT II Controller.
  • Where to install the firewall grommets for your wiring harnesses.
  • How to route the wiring harnesses to the engine and transmission.

Other Considerations

Tools You Will Need

  • No. 2 Phillips screwdriver
  • 1/8" or 3/16" flat blade screwdrivers
  • Drill and small drill bit assortment
  • Socket / open-end wrench assortment
  • Wire cutters / wire stripping pliers
  • Soldering iron and solder or wire crimping pliers

Tools You May Need

Depending on the installation, you may also need:

  • File
  • Tin snips
  • Center punch
  • Sheet metal tools
  • Insulating tape
  • Wire spade lugs
  • Wire crimp connectors
  • 1.1875" and 1.625" hole saw or chassis punch
  • Volt/ohm-meter
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