Speed/Density is where airflow is CALCULATED (not an actual measurement) from the input from an IAT (Intake Air Temp) sensor and a MAP (Manifold Absolute Pressure) sensor. The most commonly used with the MAFT Pro is the GM IAM and GM 3 bar MAP sensor. There are premade wire harnesses for those sensors available which makes a *tiny* portion of the job easier... Be forewarned, S/D is NOT... NOT!!!... easy to setup. Every engine is different so you can't just copy someone else's settings and you have to tune for many things you wouldn't have to if you were actually just translating to a different type of meter. This is not for the squeamish. If you go to
www.MAFTPro.com and clik on the "Buy Now" button for the Pro it'll take you to the Full Throttle Motorsports website. You'll find the sensors and harness available there... investing in a wideband when running S/D is an absolute must in my book; too much stuff that's going to need a LOT of tweaking and you'll be amazed how many shops can't tune these things and especially not in one session on a dyno.