background image

 

41mm (1-5/8")

slope
of hull

 

Installation

 

Hole Drilling

 

1. Cut out the template (see Figure 3). 
2. At the selected location on the starboard side of the hull, position the 

template, so the arrow at the bottom is aligned with the bottom edge 
of the transom (see Figure 4). 

 

Being sure

 

 the template is parallel to 

the waterline, tape it in place.

 

Warning

 

: Always wear safety goggles and a dust mask.

 

3. Using a 4mm, #23, or 9/64" bit, drill three holes 22mm (7/8") deep at 

the locations indicated. To prevent drilling too deeply, wrap masking 
tape around the bit 22mm (7/8") from the point.

 

Fiberglass hull

 

—Minimize surface cracking by chamfering the 

gelcoat. If a chamfer bit or countersink bit is not available, start 
drilling with a 6mm or 1/4" bit to a depth of 1mm (1/16"). 

 

Plastic Shim

 

 

Standard transom

 

 (13° transom angle)—The bracket is designed 

for a standard 13° transom angle. The shim is 

 

not

 

 needed for this 

installation. Skip to "Mounting the Bracket".

 

Stepped transom and jet boats

 

 (3° transom angle) —Use the shim 

with the tapered end 

 

down

 

.

 

Small aluminum and fiberglass boats

 

 (20° transom angle)—Use 

the shim with the tapered end 

 

up

 

 

If you are unsure about using the shim

 

, do one of the following:

• Measure the transom angle of your boat using a digital level or 

bubble level and protractor. Then follow the instructions above for 
your transom angle.

• Experiment with the shim. Follow the instructions: “Mounting the 

Bracket”, “Attaching the Senor to the Bracket”, and “Checking the 
Sensor Angle and Projection”.

 

Mounting the Bracket

 

1. Apply marine sealant to the threads of the three, #10 x 1-3/4", self-

tapping screws to prevent water seepage into the transom (see 
Figure 5). Screw the bracket (and shim if needed) to the hull. 

 

Do not

 

 

tighten the screws.

2. Using the vertical adjustment space on the bracket slots, slide the bracket 

up or down until the distance between the bottom left corner and the 
bottom of the transom equals 41mm (1-5/8"). Tighten the screws.

Figure 4. Template position

 

Align template arrow with

 

 

 

bottom edge of transom

Align template vertically

slope of hull

parallel to
waterline

 

 

Align arrow with bottom of transom

 

Figure 3. Template

 

for starboard side of boat

Drill at locations labeled “B”

for transom angles 16˚ through 22˚

(most small aluminum boats)

Drill at locations labeled “A”

for transom angles 2˚ through 15˚

(most boats)

 

A

B

A

B

A

B

A

B

 

Figure 5. Distance between

corner of bracket and

bottom of transom

 

2

 

Figure 8. Bracket

retaining cover

Figure 6. Speed sensor 

 

or

 

 blank

Figure 7. Cover

closed

opened

 

mounting ears

screws

cover

speed
sensor

transducer

housing

some installations

bracket

screw

 

actual siz

e

actual siz

e

 

(self-tapping

#6 x 5/8")

self-tapping

screw

some installations

insert screw-
driver here to
remove cover

cover

tab in slot

flush with

housing

 

co

ve

r

housing

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