'87 Saab 900 2.0 N/A  MAF  Bosch p/n 0 280 212 005 (aluminum case)

Pin #1  Filament burn-off (4v for 1 second after shut-down, controlled by PCM)
Pin #2  12v Power input
Pin #3  Ground for filament burn-off and CO idle adjustment (at PCM)
Pin #4  Ground (MAF signal - local)
Pin #5  MAF output (~1 - 5 v)
Pin #6  CO idle adjustment