I have just installed a Northstar 550i 3 days ago and I am happy with it. The reason I chose the Northstar is that it supports fuel sensors and a smartcraft gateway (for engines with Smartcraft computers). I have also installed the fuel sensors to keep track of fuel usage. It is very nice to know how much gas is left in the tank and your current milage so you know how far you can get before having to refuel. It is a lot better than depending on the fuel gauge.

Here is a link http://www.northstarnav.com/html/pro...550i-538i.html