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The Speed accessory incorporates a paddlewheel-type speed sensor in a high-impact
plastic housing. The module is intended for installation on the transom, and will work
well on almost any boat.
In addition to the parts supplied, you will need a hand drill with various bits, marine-
grade silicone sealant, and a Phillips head screwdriver.
Install the Speed accessory:
1. Locate an area on the transom of your boat that will be 6” (152 mm) to 8”
(203 mm) or farther from the transducer(s). This area must also maintain
contact with the water, even at high speeds. Do not mount the accessory
directly in front of the propeller or outdrive, and make sure that there are no
protrusions such as ribs, rows of rivets, or transducers directly forward of the
mounting location, as these may affect the flow of water over the paddlewheel.
2. Align the accessory on the transom so that the lower edge is flush with the hull
of the boat and the tab on the bottom of the housing aligns with the bottom of
the hull, and mark the hole locations. If the transom angle is excessive, a fairing
block may be needed to level the paddlewheel for proper operation.
3. On fiberglass hulls, it is best to start with a smaller drill bit and use progressively
larger bits to reduce the chance of chipping or flaking the outer coating. Drill
two 9/64” (3.5 mm) mounting holes approximately 3/4” (19 mm) deep.
4. Seal the mounting holes with marine-grade silicone sealant, and attach the
module to the transom using the two washers and two screws provided.
Hand tighten only!
Routing the speed cable to the control head:
1. You may route the cable over the top of the transom, or drill a 5/8” (16 mm)
diameter hole in the transom directly above the module and above the
waterline to route cable through. Use the cable clamps provided to secure the
cable to the transom of the boat. If you use a through-hole, then also use the
included escutcheon plate to dress the hole.
NOTE: On fiberglass hulls, it is best to start with a smaller drill bit and use progressively
larger drill bits to reduce the chance of chipping or flaking the outer coating.
2. All mounting screws require a 9/64" (3.5 mm) pilot hole drilled approximately
5/8” (16 mm) deep. Additionally, seal any hole drilled in the transom of the boat
with marine-grade silicone sealant (not included).
3. Route the cable to the control head, and insert the connector into the
appropriate slot. Use the connector designated for accessories on the
control head.
4. If the connections are correct, the control head will begin displaying boat speed
information immediately (assuming that the control head is powered on and
the boat is moving). If the speed sensor fails to read properly at high speeds,
adjust the height of the module on the transom.
Cleaning the Speed accessory:
1. You should periodically remove the paddlewheel from the housing and clean it
to remove growth resulting from the marine environment, as a clean
paddlewheel results in more accurate readings.
NOTE: This procedure should only be performed when the boat is not running, and is
normally performed when the boat is out of the water.
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