As I stare at the picture a little longer... 1 & 2 are the black and white 120v AC wires coming into the unit. 10 & 9 look like the leads from your thermocouple. 7 & 8 should be DC outputs to control the on/off function of the SSR. 3 & 4 are the alarm wires (if used, I didn't). And I am going to make a wild-ass-guess that 9-12 are used if you are not using an SSR and using the PID as the relay.