1969 Barracuda AC operation

I've rebuilt the entire AC system on my '69 factory-air Barracuda. Everything so far is testing out fine, but I'm having an issue with the blower fan. The cluster has labels for "Low ^ High", and the wiring diagram implies that the middle position is medium speed, as opposed to off. However, I only have two speeds, with the left two positions of the switch giving the same fan speed. So, I just wanted to a) confirm that the '69 Barracuda factory AC is a three-speed system, and b) ask if anyone knows what a continuity test on the fan switch connector should look like for the black, green, and dark green wires.