The sensors you received with the Universal Holding Tank Fittings Kit (SKU ERVP-HOLDINGTANKKIT) are correct and fully functional for your RV's black and grey water tanks. The sensors pictured on our website are the Horst miracle probe sensors, which are currently out of stock due to supply delays. While you can proceed with installing the sensors you have received, we will send you the Horst miracle probes as soon as they become if you prefer those. These sensors require no additional drilling beyond existing holes as they act as plugs and level detectors. Feel free to reach out if you need further assistance or updates on availability.