Anyway, myold I am working on an Arduino (open source micro controller) based solution and am currently writing the software to allow use of another very exciting open source project that plugs into any OBDII CAN (or older) bus. With this, we can read way more than just MAP, but also just about every sensor (which will come in standardized OBD data format). The cost of the system is approximately $120 USD if you source the parts yourself. So when mentioned MAP, I also meant any other readable sensor such as MAF or even TPS. I fully plan to open source the controller code on GitHub once ready for alpha. Right now my tests are utilizing a China made 50A (peak) robot motor driver module which is controlled via Arduino PWM. This system will not be like anything I have seen and the logic will be 100% tweakable granted you have the understanding. I could build in some potentiometers for min/max and gain control (to name a few), but I would have to charge for that system as it takes time to develop and I am in the red concerning time these days.