The Nexus 7 has a 4-pin connector, but the Nexus 10 has a 6-pin connector. I'm sure there's a Nexus 7 pogo pin charger available, but a quick internet search doesn't turn up much right now. On the other hand, there's now a Nexus 7 pogo pin dock available (limited supply) over at the "G" store.
I don't know, I have a Nexus 10, BUT, in the Amazon item display, you have a link to "Contact the Buyer" and I'm sure they will give you information to get one for the Nexus 7 if it is available. Good Luck.