Engine Indication System

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TACHOMETER 
Standard avionics RPM is measured by an indicator in the cockpit through drive cable.
Garmin G1000 RPM is measured by the tachometer sending unit and changed to an electrical signal. The Garmin Control Display Units (CDU) display the engine speed.
ENGINE TEMPERATURE - The system that shows the temp for  engine includes  indicators and probes for CHT and Exhaust Gas Temperature (EGT).
EGT system measure the temp of the exhaust gas. The measurement gives an indication of the fuel/air mixture. The system has one indicator installed in the instrument panel, which gives the two functions that show the EGT and CHT information. A probe installed in the exhaust and a probe installed in a cylinder, send the temp information to the EGT/CHT indicator.
Garmin G1000, each cylinder has EGT and CHT probes.
Garmin G1000, the GEA 71 Engine/Airframe Unit is a microprocessor-based Line Replaceable Unit (LRU) that receives and processes signals from the engine and airframe sensors.

GEA 71 Engine/Airframe Unit speaks directly with the GIA 63 Integrate Avionics Units.

Remove the Tachometer and Drive Cable.
(1) Disconnect the drive cable from the tachometer.
(2) Disconnect the electrical connector (JI014) from the tachometer.
(3) Remove the screws that attach the tachometer to the instrument panel and remove the tachometer.
(4) Remove the upper engine cowl.  .
(5) Disconnect the drive cable at the rear of the accessory case.
(6) Remove the two screws that attach the firewall shield to the firewall.
(7) Remove the drive cable through the firewall.
Install the Tachometer and Drive Cable 
(1) Install the drive cable through the firewall.
(2) Connect the drive cable to the accessory case housing.
(3) Install the firewall shield to the firewall with the screws.
(4) Install the tachometer to the instrument panel with the screws.
(5) Connect the electrical connector (JI014) to the tachometer.
(6) Connect the drive cable to rear of the tachometer.
(7) Install the upper engine cowl. .
Tachometer Sending Unit Removal/Installation
NOTE: Airplanes with Garmin G1000 have a tachometer sending unit.
A. Remove the Tachometer Sending Unit .
(1) Make sure the MASTER switch is in the off position.
(2) Remove the side cowl.
(3) Disconnect the electrical connector.
(4) Loosen the knurled nut.

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