Page 6
Section E
Horizon & Sundowner
Owners Manual
06/00
The tachometer gauge for the 280 Horizon and 285
Sundowner has an adjustment screw located on the
back of the tachometer gauge. Simply turn the screw
to the proper position, either 4, 6, or 8, based on the
number of cylinders the engine has. The original ta-
chometer is of course set at the factory. This infor-
mation is provided in the event one has to replace a
tachometer at a later date.
B. Speedometer
The 280 Horizon and 285 Sundowner models speed-
ometer is a water pressure sensitive unit. It has a pick-
up (pitot tube) assembly mounted on the transom and
a small plastic hose (speedo tube) that connects it to
the speedometer gauge on the dash. See Figure E5.
The pitot tube extends below the hull. Water strikes
the tube inlet and creates positive pressure. The faster
the boat speed, the greater the pressure, and the higher
the speed indication on the speedometer.
Figure E5:
280 Horizon & 285 Sundowner
Speedo Sender
If the pick-up becomes clogged, the speedometer will
not register. Clean the opening with a piece of wire or
disconnect the tubing and blow out the pick-up with
compressed air.
When winterizing the boat, the speedometer tubing
must be drained of water. Disconnect the speedome-
ter hose at the pick-up assembly and at the gauge and
blow through the tubing to remove the water.
The electronic speedometer on the 210 Horizon-265
Sundowner models have a paddle wheel sender. This
speedo sender provides accurate incremental read-
ings (+/- 1.5 MPH) at low speeds as well as high
speeds. The speedometer pick-up is located on the
transom. See Figure E6. The paddle wheel extends
below the hull.
As the boat is moving, water strikes the wheel mak-
ing it spin. The information is relayed to the speed-
ometer which displays the speed in miles per hour
(MPH). The faster the boat speed, the faster the paddle
wheel turns, and the higher the speed indication on the
speedometer.
New for 2000 is that the paddle wheel is capable of
determining the water temperature. It is equipped with
a temperature sensor and relays this information to
the module for display.
Figure E6: 210 H-265 S Paddle Wheel Speedo Sender
NOTICE
If the paddle wheel becomes fouled, the speed-
ometer will not register. Clean the paddle wheel.
NOTICE
Speedometers are not precision instruments.
The indications are relative and should never
be used for navigational purposes or similar criti-
cal situations.
DO NOT rely on the speedometer when trying
to achieve a NO WAKE condition in a harbor
or other enclosed waterway. ALWAYS reduce
throttle! Speedometers are not effective at mea-
suring low operational speeds. You are respon-
sible for damage caused by the wake of your
boat.
C. Temperature Gauge
The temperature gauge monitors the cooling system of
the engine. A sudden increase in the temperature could
be a signal of a blocked cooling passage or a water
pump malfunction.
The temperature indicator on the 210 Horizon-265
Sundowner module monitors the coolant temperature.
If the coolant temperature rises to, or above 213 de-
grees F an alarm will sound a single beep every two
seconds and the temperature telltale will illuminate.
