Eagle 1000c Operating Guide

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Once a location is determined, use the bracket as a template and mark
the mounting holes and the hole for the cables. Drill a 1-inch (25.4 mm)
hole in the dash for the power, transducer and antenna cables. Screw
the bracket to the mounting surface.
To pass all connectors through the 1" hole, first pass the transducer
connector  up through the hole from under the dash, followed by the
antenna connector and any accessory cables. Next, pass the power
cable's bare-wire end down though the hole from the top.
If you wish, you can fill in the hole around the cables with a good
marine caulking compound. No matter what type of installation you
prefer, be sure to leave enough slack in the cables to allow tilting or
swiveling the unit.
Attach the unit to the gimbal bracket using the supplied gimbal knobs
and washers. Attach the cables and the unit is ready to use.
In-Dash Installation
You can mount the unit in the dash with an optional FM-3 In-Dash
Adapter Kit. The kit includes mounting hardware and a template for
cutting the hole.
In-dash mounting template for this unit, showing dimensions.
NOTE: The figure above is 
not printed to scale.