Hey all. I have a kart team (I race myself) and we are at a point where we just want to build engines ourselves, at least for the next season in 2023. The problem is we have no dyno, and the nearest one is 250km away from my city so it's out of the equation here.

I've been looking around and found some designs, while they're relatively easy to make, with basic physics calculations one can come up with a reasonable setup. 

But the hardest part is to get all the sensors and hook them up in some way to a PC. Of course I can spend 1000 euros in a hub but im looking for something more "homemade" 

The sensors I need are flywheel rpm (obvious), engine rpm (using ignition coil signal) and some way to connect a K Type thermocouple for EGT. There is no info on the web to get around this. Im asking if I can just grab an ECU from a crashed car that I have, set it up using existing sensors, connect it to a PC via OBD2 and have the software compute the graph from there.

Other option is to find a sensor in the web, which I did search for a while, but then you need a power supply and a device to decode the signal and pass it to the computer, seems like triple the hassle. 

So if someone figured out a way to do this without resorting to expensive hardware, can I get some tips here? Cause as I said, haven't figured out a way yet to get the flywheel sensor hooked up, let alone rpm and the thermocouple

Thanks.