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Every Engine Needs a High Temperature/Low
Oil Pressure Alarm
Kit AT-4ALRM Now Available for use
with the Indigo Thermostat Kit
Diagram of Alarm System
- Utilizes proven Cole Hersee
- Allows for proper Coolant flow to normal
temperature sensor and alarm sensor
- Provides more accurate coolant temperature
- Includes necessary pipe fittings for easy
- Includes electrical crimp terminals to
facilitate wiring. (No wire included)
With the application of an Indigo Electronics
Thermostat Kit to your Atomic 4 or other small marine engine, it now becomes
possible to get a truly accurate coolant temperature reading as well as having
the opportunity to install an additional temperature sensor to serve as a high
temperature alarm. This Engine Alarm Kit is designed to do exactly that plus
provide a low oil pressure alarm to boot. Here is how it works:
- The Indigo Electronics Thermostat Kit is
installed utilizing a 1/2" tee fitting on the engine manifold instead of a
90 degree ell fitting. By using a tee, an additional 1/2" NPT connection
becomes available for sensing coolant temperature.
- The existing temperature sensor (traditionally found on the
forward end of the head on Late Model A4s) is removed from its current location
and installed in the new 1/2" NPT connection on the new tee.
- The temperature sensor provided in this kit is then
installed in the head opening. This sensor becomes the high engine temperature sensor.
- The oil pressure sensor provided in this kit is installed
in the existing oil line into which the existing oil pressure sensor ties
utilizing a steel hex nipple and a 1/8" tee. The alarm "buzzer"
is now wired in a "daisy chain" fashion from the ignition switch to
the buzzer to the oil pressure switch to the new temperature sensor in the
What can you expect with this Engine Alarm Kit installed?
When starting the engine, the alarm buzzer sounds until oil pressure is
established in the engine. (Some folks find the sound of the buzzer annoying at
startup, others find it comforting to know that the system is working). Once
operating, the only time the buzzer will sound is with a loss of oil pressure
(less than about 5 psi) or high temperature at the engine head sensor (greater
than about 210F).
Call today for Credit Card orders or send check/money order
Indigo Electronics, Inc.
105 Pipe Kiln Court
Williamsburg, VA 23185
Order Today. You never knew sailing
could be so much fun!
1-800-428-8569 toll free
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