Ethan, a buck and a half seems quite high to install a pylon, unless
extensive reinforcement is needed.
Assuming that you have a relatively flat area to work with on your rear
deck/ transom well area, the job should go smoothly. If the rear deck is
thick enough and/or backed up with wood you may be able to get away
with using just screws for the rear mounts.
The preferred method obviously is to thru bolt those mounts. Easily done
if you are able to gain access to the underside of the deck. Many boats
are filled with floatation in that area. You would then need to remove
enough flotation to gain access. (If you end up removing more than a
handful you really should replace the flotation - it's there for a reason)
Be careful in selecting the location for the main pole mount. (Drilling
into your fuel tank can ruin your day). You typically will use very
large screws for securing the mount. My suggestion is that if the floor
at that point is not over 1/2" thick that you cut a square piece of 3/4"
plywood and secure it over the mounting location and then attach your
mount to the plywood. Hopefully you will be able to dress it with some
spare floor covering material.
Good luck and good boating,
Jim

Ethan wrote:
I am considering installing a ski pylon in my 19 foot bow rider that is
outfitted with a 115HP outboard. The pylon would have a center pole and two
supporting poles. Are these difficult to install? What do you use as a
backing to support the load? What else should I know before taking on this
project. I can save about $150 if I do this myself.

Thanks

Ethan