I'm running piecoin.tech wallet so do i just transfer the wallet.dat file over to the new or transfer to exchange and back to the new wallet(piecoin.info)?
If you are running a piecoin.tech wallet and you have connections and you are synchronized with the blockchain there is no instant need to do anything for now.
But if you want to update your wallet (this has be to be done by many users in the future when new features are implemented) you just need to replace the wallet executable (don't know your system). If the executable has been replaced/updated it should be possible to read your current wallet.dat file. But please make sure that you do a BACKUP of your wallet.dat before doing the update.
cu Pikku