Eagle Electronics SeaFinder 480DF - Manual (Page 34)

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After drilling the hole, pass the transducer connector up through the
hole from under the dash. 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. (Some marine dealers stock cable hole
covers to conceal the opening.) No matter what type of installation you
prefer, be sure to leave enough slack in the cables to allow tilting or
swiveling the unit. If you choose to fill in the hole, be sure to position
the cables against the rear edge of the hole as you apply the fill
material.
Front view (left) and side view (right) showing dimensions of the
sonar unit when mounted on gimbal bracket.
Before positioning the bracket, be sure to hold the cables against the
rear edge of the hole. Then, slide the bracket over the hole and butt the
rear of the bracket base firmly against the cables, thus pinning them in
Millimeter
[Inch]
23.4
[0.92]
72.9
[2.87]
137.9
[5.43]
56.9
[2.24]
157.9
[6.22]
173.9
[6.85]