Read many great post and pic's for high water alarms and additonal bildge pumps on CP. I decided to go with a manual/auto big red light switch to act as a high water alert and to have a pump mounted to battery shelve to hopefully pump out that high water. The Johnson pump was good rec' from the post on CP. Their sensor over float switch solved any mounting probelms. The dealer(and a good one) 3AMarine lined up the thru hulls in height order of the pumps so as to correspond to water and pump height. Rather weird to install a item that I hope a NEVER use.