SOFT-I/O

Soft-I/O connects sensors to a network in a way that is so revolutionary that it has reinvented the I/O marketplace. Fuel level data and and building temperature are sent to the Soft-I/O controller via individual sensors, which the contoller communicates over its Ethernet network interface. The monitoring interface for Soft-I/O is its built-in website server. Your computer then accesses the server and becomes the "gauge" which can then be read from anywhere on the internet.
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Unitronics

Unitronics is a palm-sized PLC with a built-in Operator Panel. The panel offers a graphic display screen and keypad.The Graphic HMI display screen can show images, text, and graphs according to real-time parameters. It can also display graphs based on historical values, to reflect trends of recorded data. Use your PC to access the remote PLC via network connections, Ethernet, cellular (GPRS/GSM/CDMA) or landline modems to monitor fuel-level temperature and more.
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IT Watchdog

Easily view and log temperature and other connected sensors over the intranet or the Web. No software required - securely access the graphical user interface from a web browser. Mounts with four screw holes. Power adapter included. Supports both digital and analog sensors.
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Rube Goldberg Special--Complete Webcam Fuel and Temperature Monitoring System
  
So you want a down and dirty system to monitor fuel level and indoor/outdoor temperature for a dirty low price? We've got just the solution. This system includes an OEM Rocket 7000, an Indoor/Outdoor thermometer, and an IP Webcam. View all your gauges (and anything else) on any computer, anywhere. See?

And the best part is that you don't need a computer at the remote site--just an ethernet connection. So easy to install, even a caveman could do it.
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