Q.   Why is my fuel gauge not working?


A.   The most common problem is the circuitry is not complete.
        To test this out, use a voltmeter and check the continuity on wires going to the fuel sender. Next, disconnect
        the wire from the Fuel Gauge and check for continuity to the ground.


Q.   Why is my tachometer jumping?


A.   Check:

  • Is your ground on the engine block? And NOT NEAR THE ALTERNATOR?

  • Is your engine grounded to the chassis?

  • Is the body grounded to the chassis?

  • Is your red B+ wire going to the battery, when using the pink wire as key on power?

  • Make sure the Tachometer wire is not near power wires or touching coil.


Q.   Speedometer


A.   Check:

  • Black wire goes to where the dash is grounded at the back of engine block.

  • Red wire goes to key on power or same as pink wire.

  • White wire is speedometer output wire and goes to the white wire on the Intellitronix Dash.

Q.   Speedometer Speed Sensor Wires 
        My Speedometer is bouncing when I rev my engine on my car/truck.  Why is that?


A.   Check:

  • Check ignition key on power and ground source are hooked per the install guide!               

  • If using Intellitronix speed sensor, take the three wires and make a 10 to 12 foot pig tail. Place connector end in a vice. Place all three wires in a drill and twist them together. Use Zip Tie to tie wires every two (2) foot and put them in a wire loom. 

  • Make sure speed sender wires are not running next to any other power wires or spark plug wires.


Speedometer Wire Diagram

  • For the speedometer in these years you need the wire diagram. GM was not consistent with wire color or pin   location, also they sometimes used what is called a VSS Buffer if this is being used the best place to pick up      Speed Signal is the Output side or Factory Speedo wire. The other way is from the ECM/PCM VSS Output        Signal wire.

 RF Noise Problem 

  • Here is the most common fix to the RF noise problem. Check to make sure you are not using solid core        ignition wire or non-resister spark plugs. Using a HEI Distributor or an Ignition box will also omit high frequency noise. With these you will need a Tachometer Filter.

Circuit Boards

  • We are updating the Circuit Boards here at Intellitronix to make improvements. Some of the power wires may not be correct in Installation Guides. The most common one is on the dashes with one power wire it will be Key On Power Pink or Red.


  • If your dash has Pink and Red, the Pink is Key on power and the Red is going to be constant Power.

  • If you have just Red and No Pink, then the Red wire is Key On Power.


  • You can always verify the wires by looking at the Board where the wires are. The board is marked by wire position.

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34099 Melinz Pkwy Unit E, Eastlake, OH 44095 USA

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