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GETTING STARTED > INSTALLATION
6 Fishfinder 250/250C Owner’s Manual
Flush Mounting the Fishfinder 250/250C Unit
The Fishfinder 250/250C can be flush mounted on a flat panel. When
flush mounting the Fishfinder 250/250C, choose an appropriately
sized location for the unit. Use the Flush Mount Template provided
in the box to determine a location. Check that all cables reach the
unit mounting location before beginning installation. Always wear
safety goggles and a dust mask when drilling, cutting, or sanding.
To flush mount the Fishfinder 250/250C:
Included mounting hardware—Four 3mm studs, four flat
washers, and eight 3mm hex nuts.
Tools (not included)—Center punch, drill, 1/8” (3mm) drill bit,
3/8” (6mm) drill bit, jig saw, 1/16” (2mm) Allen wrench, and
9/32” (7mm) wrench.
1. Trim the Flush Mount Template and tape it in the appropriate
location.
2. Using a center punch, indent the center of each mounting
hole location.
3. Using a 1/8” (3mm) drill bit, drill the four mounting holes.
4. Using a 3/8” (6mm) drill bit, drill a hole for a location to begin
cutting the mounting surface.
5. Using the jig saw, cut the mounting surface along the inside
of the dashed line indicated on the template.
NOTE: Be very careful when cutting this hole; there is only a
small amount of clearance between the unit and the mounting
holes. It may be prudent to cut slightly inside the indicated line
and then sand or file the panel as needed to obtain the best fit.
6. Install the four mounting studs into the unit by screwing the
shorter section into the back of the unit. Use a 1/16” (2mm)
Allen wrench to tighten the mounting studs until the stops
contact the case. Be careful not to overtighten, as this may
damage the mounting stud. The studs have a reusable
thread-locking patch pre-
applied from the factory.
7. Place the unit in position
inside the cutout area of
the mounting surface.
8. Place washers over the
mounting studs, then
thread on one hex nut per
mounting stud. Tighten
all four hex nuts until the
unit is snug against the
mounting surface. Install
and tighten the second hex
nut on all four mounting
studs to lock the first hex nut in place.
Studs
Washer
Hex nuts
Mounting surface (as seen from back)