The shower gets it's hot side from the engine block and cold from a "T" on the PRESSURE side (after) the raw water pump. The shower demand pump actually sucks the mixed water thru the system...that's why you only need one pump. Mine only comes on when you activate the push buttom on the shower head (can also be switched off electically at the helm.)
If you need more explanation/moral support feel free to pm me. This is definitely a DIY and will cost you $200 +/- plus a day of running hose and cutting-in the mixing valve panel.
Wes _________________ just broad reachin' thru life...
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