Electronics International US-8A - Manual (Page 25)

Installation Instructions
Mark each of the appropriate extension cables (on the yellow heat shrink) with the function for which it is to
be used (i.e., CHT, EGT, OAT, EGT R., EGT L., etc). An ink pen or marker works well.
E.I. recommends you use the left display starting with channel number 1 for your EGT’s and the right display
for your CHT’s. On a twin-engine aircraft the left display should be used for the left engine and the right
display for the right engine (see sample wiring diagrams).
Note 1: Any channel will accept any one of E.I.’s probes.
Note 2: Some temperatures require a yellow Precision Connector (OAT, Carb Temp). Match these cables
with the appropriate probes and plug them into a precision channel.
Note 3: The wire harnesses for a twin-engine aircraft will arrive with the red Slip-on Connectors removed.
The connectors are left off to facilitate installation. Slip-on Connectors are supplied in the accessory kit and
will be installed in step 10.
Note 4: If a cable needs to be removed from a connector, you must use an extraction tool. This tool may be
purchased from E.I.
9. Route the Circular Connectors:
Do not continue with this step unless each Extension Cable has been marked as described in step 8.
Starting from under the instrument panel, route the Circular Connectors on both Extension Cable Harnesses
and on the Connecting Wire Harness up to the instrument mounting location (see the Wiring Diagram at the
back of this manual). Place the Circular Connectors 9 inches back from the front panel. Tie wrap the
harnesses in place approximately one foot back from the Circular Connectors. This will allow the harnesses
to be flexible and accommodate varying lengths in instrument wires.
10. Route Each Extension Cable:
Starting from under the instrument panel, route each Extension Cable to its appropriate probe. If new
connectors are to be installed on the ends of the cables, you may want to pull any excess cable length through
the fire wall and cut it off at this time. However, it is recommended you leave some extra wire length under
the instrument panel for later modifications. You may cut any or all cables to any length without any affect
to the accuracy of the instrument. The Extension Cables and probe wires are made of type K thermocouple
wire that must not be substituted or extended with regular copper wire. Also, it is important these wires not
be kinked (i.e., do not bend the wires on a radius less than 1 inch).
Attach the appropriate connectors to the ends of each of the Extension Cables as described below:
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8. Mark Each Extension Cable