Digital Solutions for Cadillac Engine Swaps...Diesels...307's

Spring 2024:  The E/K Display Controller is now available for immediate shipping.
See below for packages, pricing and contact information.

"The E/K Display"

Finally, a stock-looking, integrated instrumentation solution for 1982-85 Cadillac owners who have
swapped out their HT4100 and now have a defunct Fuel Data panel.

Or replace the filler plate on your diesel or post-'85 RWD model with a 4100 display module.....Plugs right in!


  • Oil Pressure 0-60 PSI
  • Engine Temperature 0-275F / Switchable to Celsius
  • Battery Voltage w/over-voltage alert
  • 'Loss of Oil Pressure' Warning
  • Two Over-Temperature Alarms
  • Torque Converter Lockup Feature
  • 3-Level Brightness Control or variable with Dash Dimmer
  • Compatible with all 1982-85 "MPG Sentinel" & "Fuel Data" Displays (Eldo, Seville, Fleetwood & Deville)

This self-contained unit plugs directly in to your existing Fuel Data display and installs easily under the dash. Coolant Temperature, Oil Pressure and System Voltage ( Cadillac parlance) are displayed at the touch of a button, and a new laser-etched overlay with factory-style text is included on Economy & Turn-Key packages. Should you want to be warned of loss of oil pressure, or an engine over-temp situation, a single connection to the factory warning chime is all that’s required. It will even drive your Coolant Temp light, since the 4100's ECM previously handled that.

For minimal wiring, 3-levels of display brightness are built-in, or connect to your headlight switch & rheostat and the digits will dim variably with your other displays. Brightness has been calibrated to track the factory brightness curve. And just like the other factory displays, the 6's and 9's retain their distinctive "tails".

A genuine problem after an engine swap is how to lock up the transmission torque converter.... The processor board also handles that! It prevents TCC engagement until the engine is warm and provides a delay after input conditions are met to prevent short cycling. Plus it works with the normally-closed 4th Gear Switch these cars use. Just add an aftermarket vacuum switch to sense engine load and you're set!

A built-in configuration menu lets you customize settings via the control buttons, and all circuitry is protected from jump start, reverse battery connection and other electronics-killing transients.

Each unit is hand-assembled, programmed, tested, and includes a 6-month warranty.

Video Demonstration showing a few of the features in real-time.

Display Packages

-Three packages are offered to suit skills and budget-

Available on a first-come, first-serve basis, Economy & Turn-Key package availability is limited due to display
connector sourcing. 
These connectors are NOT available new, my only source is junk yards and eBay which I've been
accumulating the past several years. With this constraint, only a limited production run is planned at this time.


$195 DIY Package: For the experienced do-it-yourselfer with soldering and shrink-wrap skills.

  • Includes the "E/K Display” Controller, pre-programmed and fully assembled in its enclosure.

  • The 15-conductor display cable is also attached, but you must supply your own GM Fuel Data connector to plug into your display. This is where the soldering/shrink-wrapping comes in.

  • Inline fuse and fuse holder supplied.

  • Installation and Operation Manual included along with pinout instructions for the display connector wiring.

  • Does not include the acrylic display insert nor any wiring harnesses or sensors; P/N's are provided.

$295 Economy Package:

  • Pre-Programmed "E/K Display" Controller with connector, ready to plug into your Fuel Data display.

  • Laser engraved “Engine Data" acrylic display insert (3 styles to choose from).

  • Inline fuse and fuse holder.

  • Diode Splitter for Chime & Coolant Light

  • Installation and Operation Manual

  • You supply your own sensors and wiring, available at major auto parts stores.

$395 Turn-Key Package: Complete and ready to install “out of the box"

  • Pre-Programmed "E/K Display" Controller, ready to plug into your Fuel Data display.

  • Laser engraved “Engine Data" acrylic display insert.
    (3 styles to choose from).

  • Automotive-grade oil and temp resistant TXL wiring to engine compartment for coolant temp and oil pressures sensors; includes pre-soldered metri-pack connector for coolant sensor.

  • Inline fuse and fuse holder. Plus additional "hookup wire" for under-dash connections.

  • Diode Splitter for Chime & Coolant Light

  • NTK Temp Sensor #EF0008

  • VDO 360-003 Oil Pressure Sending Unit

  • Unit is fully calibrated using the included sensors to ensure you are ready to run.

  PS157 shown, superceded by VDO sending
unit with twice the resolution.

For Orders & Questions, reach out to me at with your Package Preference.
For Economy & Turn-Key packages, please specify your choice of lens insert: '82/83, '84/85, or RWD.
Multiple forms of payment are accepted; shipping is a flat $9.95 in the US.

If you'd like to learn more, the user manual is available for download HERE.

A Word about the Acrylic Display Inserts

My background is in electronics, but I thought it was important that the display have as close to a factory look as possible. The original inserts were molded and hot-stamped, something not available to the little guy. I strive for perfection, but please understand my version is basically hand made on an individual basis and in some cases, may require a little finesse to fit depending on age and production run of the original housing.

I use the same type and thickness material as OEM, but the button holes and outline are laser cut, then the text (modified to match the original font) is laser etched from the backside. The parts are turned over and material is laser-removed to create the recessed areas that receive the housing's tabs. A coarse strip is also etched along the top to help disperse the backlight.

Next, the front and rear surfaces are polished with Novus to remove laser haze and the text gets a lacquer paint infill and cleanup. Then I mask the faces and apply two coats of paint to the top edge to give the reflected light a slightly blue tint, just like the originals. 1984/85 inserts are then fully masked and two coats of black paint is sprayed on the ends. Once all paint is dry, there's a final round of polishing, then a test fit on an original housing. It's a time-consuming process, which is why the DIY kit does not include the insert at this time.

Return to Main Index Page  Cory Heisterkamp - May 2024