Hey All. I am buying a 1979 Orrion Boat, and I will be wanting to add some stuff to the electrical system. As of right now, I can only think of these things. A stereo system: I would need to know everything to buy, as I am new to the electrical parts of the boat. I would also be looking to add a bilge pump, and maybe a power trim... not sure if the boat already has one... I don't think there is one. It has a 1978 Mercury Model 850 on it, and I am guessing that it has its own alternator/battery charger that works through the motor. I might also need to buy a tachometer and speedometer, and I would like to get them lighted, so that if I boat at night, I can see those. Also, it has been brought to my attention that I should add a battery switch (one that cuts off power coming from the battery to items on the boat.) How much should I pay for one of these, where should I put it on the boat, and how do I install them. Thanks so much in advance!