I just got an interesting question.

Can I use X sensor?

The answer depends on three basic properties;

1  you need a 1 Bar sensor for best accuracy

2 it must operate at 5V and produce a voltage swinging from as low as possible to as close as possible to 5V for ultimate accuracy.

3 It needs a 3 pin connector (5V, Ground, signal (in any order, as long as you know which pin goes where)

We are really looking for a MAP sensor that was designed to work at 1BAR. That means it was originally intended for use in a vehicle without a turbo! This is important because a turbo sensor may go up to three Bar or more and we only need to measure the carburettor or throttle body vacuum (the values below 1 Bar). Going to three reduces the accuracy by a factor of 3 (almost). It would still work and probably still be accurate enough for a decent tune-up, but insane accuracy is one of the main attractions of CarbOnBal!

It needs to be powered by 5V because that is what our Arduino works with, using a 3.3V sensor would require an extra power supply and a voltage reference, that is more external components and a few lines of programming. It can be done but I can't support stuff I can't test myself.

There are some crazy sensor designs out there with many pins. I have no idea how to hook them up, and they probably require more external components to use. Stay away from these at all costs. There could be designs that are usable, but you are on your own if you decide to use one of those units.