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Controlling the Instrument Cluster's Display

74935 Views 470 Replies 65 Participants Last post by  Mario

A little project I'm working on. :) (Sorry for the horrid picture!)

Here's the elevator pitch: Directly control the LCD panel with a microcontroller to display custom information on the instrument cluster. The microcontroller will also read the data that would normally be going to the LCD and can choose to display that info or custom info.

Maybe you want to display OBDII parameters where the MPG is. Maybe you want to change the charge, assist, and SOC gauges to accurately reflect amps in/out, real battery SOC, etc.

I've got a few other ideas as well. Once I'm finished with this project I'll open-source everything I've learned and perhaps produce some PCBs to sell. We'll see!

I have work and other projects as well, so it may be slow going at times. But I'll try to give updates fairly regularly.
I don't think this has ever been done before. I hope you guys are excited!
If anybody is or wants to work on something similar, I'll be glad to share what I know; just ask.
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Any idea what kind of VSS signaling the cluster uses? Which other cars share that signaling?

Plan to really dig through this thread in the next day or two, amazing information here. :grin:
I really enjoy reading updates like these. I guess I must have a similar affliction.

Looking forward to the day I can hopefully install at least one of these in my 2005 or my 2006 Insight.
Likewise. Nice to see updates.
It sounds to me like some of the changes / features you've added will make this much more useful to those with engine swaps. For instance, if fuel economy is coming directly from injector on time, it will work without the stock ECU.
I'm cool with soldering.

What functions would cease to work in a car that doesn't have the original ECU (e.g. engine swap) ?
Everything should still work fine, except any OBDII parameters that the original ECU supported that the new one doesn't. This could potentially break some Pegasus-calculated parameters if they happen to use those unsupported parameters.
Actually, all ECU parameters might not work depending on the new ECU. Pegasus uses a special Honda-specific OBDII communication format that other ECUs might not support.
The ECU in question is a similar era Honda ECU, from a vehicle that's highly electrically compatible. I suppose we'll see.
Congrats, and welcome! It's always a huge upgrade over renting. I would not, however, count on having more free time.
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