Lowrance electronic LCX-17M - Manual (Page 37)

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Speed/Temperature Sensors
Optional Speed Sensor Installation
All the units in this series can display speed and distance traveled, but
only the LCX-17M comes packed with a speed sensor. If you wish to
purchase an optional additional sensor for your unit, refer to the
accessory ordering information inside the back cover of this manual.
The following instructions describe how to install the speed sensor.
Recommended tools for this job include: drill, 7/8" drill bit, 1/8" drill bit
for pilot holes, screwdriver. Required supplies for this job include: four
#8 stainless steel wood screws (3/4" long), high quality, marine grade
above- or below-waterline sealant.
First find a location on the boat's transom where the water flow is
smoothest. Don't mount the sensor behind strakes or ribs. These will
disturb the water flow to the speed sensor. Make sure the sensor will
remain in the water when the boat is on plane. Also make sure the
location doesn't interfere with the boat's trailer. Typically, the sensor is
mounted about one foot to the side of the transom's centerline.
Once you've determined the proper location for the unit, place the
sensor on the transom. The bottom of the bracket should be flush with
the hull's bottom. Using the sensor as a template, mark the hull for the
screws' pilot holes. Drill four 1/8" holes, one in each end of the slots.
Mount the sensor to the hull using #8 stainless steel wood screws (not
included). Use a high quality, marine grade above- or below-waterline
sealant to seal the screws. Make sure the sensor is flush with the
bottom of the hull and tighten the screws.