My '72 vette had a ton of toggle switches built into the console, where the stock a/c controls were, and where the ashtray/lighter were is a bunch of pretty flickering lights.....two rows of 4 red LED's....they run off the tach pulse and flicker in the firing order two blue LED's flicker back and forth for the batch fire injection....green LED for signalling the engine is live, and the SES light....
I also have an anti theft system wired in....need hit a garage door opener button to enable the computer.....with the ignition ON, of course.....
I was going to post a pix of the interior/console, but reverting back to a win10 machine, I don't have the pix on this machine....lovely....