Parameter Wiring dialogue box will appear. Click on "From to" button (-->) in this window.
Now click "Connect" button. Our second gear will now rotate with the first gear. But it will rotate in the same direction of the first gear which is wrong direction for it.
Place your cursor beofore "Y_Rotation" in the lower-right expression box and Type "-1*". Then click "Update" button.
We have just opened our tutorial directory! Feel free to submit tutorials hosted on your website or other online tutorials that you think are worth mentioning.