Open a 2" dimension and 2-3/4" depth hole, put gauge into it and fasten
Backlight: White and Yellow available
Power on the WiFi Gauge, and then search WiFI SSID as below from your PC or Mobile Phone: WiFi SSID: S190A-xxxxxx(It Starts with S0190A for WiFi Tachometer) Default WiFi Password: 12345678
9-32VDC(12VDC/24VDC) Working Voltage, 100% Waterproof and anti-fogging protection