Installation manual

GEM INSTALLATION MANUAL DOCUMENT No. 070906 REV. 1.4
INSIGHT
INSTRUMENT CORP. 13 BOX 122, FORT ERIE, ONTARIO, L2A 5M6
The Probe Type 2872 Boss fits in a 1/2” inch hole and should be welded by an approved exhaust repair facility.
Locate and drill the probe hole as described in Section “INSTALLING THE EXHAUST GAS TEMPERATURE
PROBES”, and refer to Drawing No. 8254 for the recommended location.
NOTE: If you have questions as to the correct type or location of TIT probes, call Insight Product Support for
technical assistance.
Installing The Manifold Pressure Tee
The GEM is supplementary for manifold pressure. The GEM's manifold pressure sensor(s) are located internally
inside the GEM display. The installer must supply the tubing and a "Tee" fitting to connect the GEM to the
existing manifold pressure indicator.
For single-engine aircraft refer to Drawing 610C-315 for the location of the G3 Manifold Pressure port (5/16"-24
#2 Flare fitting) or Drawing G4-315 for the G4 GEM (use port #4).
For twin-engine aircraft the G4 twin GEM (G4-002) has two manifold pressure ports, refer to Drawing G4-315,
use port #1 (top) for the left engine, and port #4 (bottom) for the right engine.
Installing The Oil Temperature Probe
The GEM is supplementary for oil temperature. Install the Insight Oil Temperature probe into an existing tapped
hole in an oil gallery in the engine. Insight can supply Oil Temperature probes in a variety of thread sizes to
suite most engine types. Consult with the engine manufacturer to determine the probe-hole location and thread
size. Ensure the probe does not interfere with any internal engine components. Refer to Drawing 610C-315 for
G3 electrical connections or G4-315 for G4.
Installing The Oil Pressure Sensor
The GEM is supplementary for oil pressure. Install the Insight Oil Pressure Sensor (1/8 NPT) on a length of
flex-hose "Tee-ed" into the existing oil pressure sensor. The Installer must supply the "Tee" fitting, flexible hose
and mounting hardware. Refer to Drawing 610C-315 for G3 electrical connections or G4-315 for G4.
Installing The Tachometer Wiring for RPM
The GEM is supplementary for Tachometer. Insight provides a shielded cable with included protection-resistor
(Insight P/N 610C-026) for connection to a magneto. Refer to Drawing 610C-315 for electrical connections for
G3 or G4-315 for G4.
For aircraft equipped with electronic ignition systems with a tachometer signal output, use Insight Tachometer
Signal Adapter P/N 610C-027 instead of P/N 610C-026. Wire according to Insight wiring diagram #101123.
Installing The Vibration Sensor
The GEM is supplementary for Vibration Measurement. Insight provides a shielded cable pre-terminated with a
mating circular plastic connector (CPC) for connection to an Insight Vibration Sensor (Insight P/N 1000-004V).
For GEM models with a 25-pin D-sub connector refer to Drawing 610C-315 for electrical connections. Wire as
shown for option "A". For GEM models with a 37-pin D-sub connector refer to Drawing G4-315.
Older Vibration Sensors and cables were equipped with a 7-pin CPC. New production sensors and cables are
equipped with a 6-pin CPC. The two different connector types are not compatible. A cable adapter P/N G4-809A