“...aaaand there’s one of the major technical hurdles, at least as I’m aware of. I haven’t looked into it in a while. That pressure sensor is going to see on the order of 100 million pressure cycles over the life of the engine. That’s a lot.”
Piezo might be able to do it.
That’s what we use - Kistler. They’re pricey and finicky. Not sure how well they last in continuous use. Not saying 100e6 + cycles isn’t possible. I just think it’s dicey for a low cost automotive part.