It has an 8 tooth drive gear from the factory. This means that you have to pull the tailshaft housing and swap in a 7 tooth to do it correctly. The white driven gear that a lot of places sell is a hack fix, and based on feedback from people who have used them - it's not a good idea! Do some searches in the forums and you'll find some great pictures of them with the teeth all sheared off.
The only alternative is one of the electronic boxes (frequency to frequency converter), but they're a bit pricedy and mix reviews on durability.