Last year I bought a 1996 Sprint bass boat and now that the boat is in the garage for the winter I would like to add and replace a few things to be ready for the new season. What is involved in changing the impeller on a 150 Evenrude(E150GLEDM) snG03775819 and should I use OEM or aftermart part. Also what is needed to instal the 2 guages and and instructions or pics on the above installations. Any other ideas on what you would do on a boat and motor this old would be a great help