Here is a guide for setting up multiple masternodes on the same machine:
This is proof that I am running 8 masternodes on the same machine.
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Make sure that each node is using its own wallet.dat.
You will be using a .bat file to launch each node except node1, which you launch using 8bit-qt You create a .bat just like you would a .conf, but with the .bat extension of course.
Also, when launching a wallet for the first time, set masternode=0 in the .conf file Use the command "masternode genkey" for each wallet once you have launched with masternode=0.
Send exactly 112 coins to the new wallet address and paste your masternode's private key in the .conf file. Then close the wallet, set masternode=1, and assign a different port to your masternode than the others.
Then, relaunch the wallet using your .bat file and wait until your deposit of 112 coins has at least 16 confirms. After you have 16 confirms, go back to the console and type "masternode start"
You should receive a message, "masternode started successfully"
Make sure you open any ports you want to use on your router.
Sorry this isn't super descriptive. If you guys have any questions, feel free to ask.
I felt like having a visual aid might help some of you.
If I helped you out: 8FAi73E6iFLtzocfcLCvd5ZfVq643eo9Ui