The Tank Monitor system includes a convenient power on function that lets you know that your sensor has been installed, and is functioning, correctly.
External tank sensor is adhesive-backed
Internal tank sensor is used on metal, wood-core, or plastic tanks that are inaccessible, or otherwise non-compatible with the external sensor tapes. These are completely solid-state sensors encased in a PVC tube. The sensor installs in a 1" NPT threaded port in the top of your tank
An adaptor plate is available for an internal sensor installation where a 5-hole SAE inspection/sensor plate already exists in the tank (see table). The adapter plate has a 1" NPT threaded hole in the center for mounting the internal tank sensor