Prototype in-car display

This is a display I’m working on to replace the clock in the NSX. It will show various parameters from the data-logging system I have, the Zeitronix ZT-2. In this video, the display is configured as follows:

From the bottom to the top,

• At top is a bar graph showing boost, following the same color coding as for the numeric MAP display below.
• Numeric displays show Manifold Air Pressure (MAP) and Air:Fuel Ratio (AFR).
  • MAP is red under vacuum conditions (no boost), yellow when entering boost, and then green above 4 psi (max is about 6 psi with this supercharger setup).
  • AFR is red when not under boost, white when AFR is below a desired value based on boost, and blue if above that value. I used a simple set of conditions where under a certain boost (currently set at 4 psi), the AFR must be under a certain value (set at 13 currently). For MAP above that boost threshold, the AFR must drop linearly (currently set with a slope of -0.5, so AFR must be under 12 at full boost of 6 psi).
• The fat bar near the bottom is the tachometer, which changes color to indicate shift point (green > red > blue).
• On bottom is a bar graph showing throttle position.

All the color-changing, moving elements are pretty confusing, and the display is very small. I need to think about the best information to display and the best way to display it. But this is a test setup to try out a few things. Figuring out the best way to draw bar graphs, changing colors, and even the numeric values took some time. There are still a couple of weird issues with reading the data consistently, as you can see in a flash of the display where MAP has a problem (at 0:12 in the video).

I don’t think there is any need for MAP unless under boost, so the numeric display for that can go away. TPS is similar: it’s not really something I want displayed. I will probably change the tachometer to only show up from 7,000-8,000 rpm, as a shift light. Otherwise, I have no need. So that leaves AFR and the boost gauge. I may do AFR with a bar graph too, as reading numbers isn’t all that useful. I do have a separate, very bright 4-digit alphanumeric display that I am considering adding, which could display AFR only when under boost, for example. I also have to think about how to mount the OLED in a way so that it’s shadowed from the sun, as that will be required for readability. Fun project though.