XPresso Gears and Rotation

Hi all,

I'm sure this is an easy one for some XPresso expert. I'm trying to animate the classic gear 1-gear 2, and can't figure out how to make gear 2 rotate in the correct, opposite direction as gear 1. I can build the XPresso that turns gear2 when I turn gear 1, but it turns it in the same direction. How do I reverse the direction? I can't seem to find a node or input to allow me to enter a negative value. Can someone point me in the correct direction, cause the manual reads like stereo instructions and is not very helpful.

Thanks

Dan...