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Retail for the SG-E is $99. If you look on eBay or even in the For Sale section of EcoModder, the going rate for used SG-II units is about $100-$120. Since the devices are so simple, with hardly anything that could wear or break, looking in the used market is a great way to save money and get all the features that come with the SG-II over the SG-E.
The main thing with SG-II vs SG-E is that you only get 2 gauges at a time with the SG-E. The gauges come into play for hardcore eco drivers. For example, if you have a grille block you need to monitor your water temperature. The factory gauges are not precise enough. You might also want to monitor engine load if you use DWL. Having 4 gauges vs 2 gauges is a major advantage, and well worth the extra money.
I was really looking at the SG-E before I realized how much data I wanted to monitor. I am in the process of deleting my alternator, so I need a way to monitor battery voltage accurately. I have a lean burn civic, and the SG-II allows you to program custom x gauges, one of which can be used as a lean burn indicator. It quickly became clear that screen real estate is very valuable, and I want all the space I can get. Spend a little extra money (or buy used) and get all the extra features that you are going to wish you had later on.
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