This video provides one example of how to install an Omnimeter. There are in fact many possible ways to install an Omnimeter. Situational variables will determine how your installation may differ but this video should at least provide some of the basic principles you should consider when installing your metering system. In this case the meter is an Omnimeter Pulse v.4 but installing a v.3 or v.5 Omnimeter is done in a very similar way.
The video also describes how to read the Omnimeter with a computer via direct connection, how to make meter settings, how to setup a wireless connection to read the meter remotely, and how to install the EKM Push (now Push3) gateway for cloud-based data.
You can use the following links to jump to specific video parts:
Part 1 - The Products
Part 2 - Enclosure Installation
Part 3 - Testing, Pulling Wires, and Labeling
Part 5 - Preparing the Meter
Part 7 - Setting Up the USB Converter
Part 8 - Making Meter Settings
Part 10 - Software Options
Here is another installation video from Appalachian DIY: