I am on my very last step to create a digital steam (yes, steam) engine indicator. The sketch is written, the rotary encoder works, the display displays. The only loose end is the pressure sensor for the cylinder to draw the pv-diagram.
I originally used those cheap 1/8NPT pressure transducers you can find on ebay for around 10 bucks, but their limitations soon showed me there was a reason why cylinder pressure sensors are more expensive. The cheapest solution I found is using Vauxhall glow plug pressure sensors (probably with the glow plugs as unused dead weigth, but who cares as long as I can get it to spit out some useful data)
The only loose link would be to get datasheets of those glow plug sensors (or sensor glow plugs) Unfortunately, I haven't been successful yet. Does anyone have an idea?