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4. Position the second cable clamp
halfway between the first clamp and
the cable hole. Mark this mounting
hole.
5. If a hole has been drilled in the
transom, open the appropriate slot in
the transom cable cover. Position the
cover over the cable where it enters
the hull. Mark the two mounting
holes.
6. At each of the marked locations, use
a 3 mm or 1/8” bit to drill a hole 10
mm (3/8”) deep. The prevent drilling
too deeply, wrap masking tape
around the bit 10 mm (3/8”) from the
point.
7. Apply marine sealant to the threads
of the #6 x 1/2” self-tapping screw to
prevent water from seeping into the
transom. If you have drilled a hole
through the transom, apply marine
sealant to the space around the
cable where it passes through the
transom.
8. Position the two cable clamps and
fasten them in place. If used, push
the cable cover over the cable and
screw it in place.
9. Route the cable to the instrument
being careful not to tear the cable
jacket when passing it though the
bulkhead(s) and other parts of the
boat. To reduce electrical
interference, separate the sensor
cable from other electrical wiring and
“noise” sources. Coil any excess
cable and secure it in place with
zip-ties to prevent damage.
4.6 Optional Water
Temperature/Speed
Sensor
Water temperature/speed sensor
ST-02MSB and ST-02PSB, which are
designed for thru-hull mounting, are
optionally available. Install them as
shown below.
Mounting considerations
Choose a suitable mounting location
considering the following:
• Choose a place free from vibration.
• Choose a mid-boat flat position. The
sensor does not have to be installed
perfectly perpendicular. The sensor
must not be damaged in dry-docking
operation.
• Choose a place apart from equipment
generating heat.
• Choose a place in the forward
direction viewing from the drain hole,
to allow for circulation of cooling
water.
1. Dry-dock the boat.
2. Make a hole of approx. 51 mm
diameter in the mounting location.
3. Unfasten locknut and remove the
sensor section.
4. Apply high-grade sealant to the
flange of the sensor.
5. Pass the sensor casing through the
hole.
6. Face the notch on the sensor toward
boat’s bow and tighten the flange.
7. Set the sensor section to the sensor
casing and tighten the locknut.
8. Launch the boat and check for water
leakage around the sensor.