non-running wall art - $100-$200
fully running outboard - $200 however may take a while to sell
fully running and cosmetically restored - $400-$600 - may take a while to sell
cost to get it there..... about as much as you will get for it.
restore the old motor because it means something to...
from the ignition switch working backwards.
ignition switch.......harness connector near the controls/dash...... harness connector at the motor (big round connector)......battery terminal on engine at starter...... battery
dont forget the ground path
and by shiny metal, we mean polished like your mother-in-laws fine silverware.
use 150 grit sand paper, a wire brush on the end of a drill or similar to get the metal shiny
once done and tight, seal the connections with marine electrical varnish
a good volt meter
for a generic lead acid battery:
12.0 volts is fully discharged
12.7 volts is fully charged
AGM is slightly different
you should have two batteries for what you want to do, one cranking battery and one house battery separated by at least a battery switch or ACR
trim tabs will not help when docking
you will loose fine control when docking, however it would be manageable
think of it this way, single props are like running summer tires on snow covered ice.
duo props are like running studded snow tires