Tell us about yourself!
IIC I2C Logic Level Converter Bi-Directional 5V to 3.3V - suppose to do the conversion job, here is bunch of them on ebay: https://goo.gl/4DB6tO
Thank you for sharing! Your project has inspired me to take it a little bit farther and create a true IoT device, I planning to connect it with ESP8266 and create alerts in case of HI/LOEW pressure as well as calculate average pool running time.
Wireless Pool Filter Pressure Sensor