AEM Analog EGT SAE Gauge 305131 User Manual

							 
 
 
 
AEM Performance Electronics 2205 126th Street Unit A, Hawthorne, CA. 90250 Phone: (310) 484-2322 Fax: (310) 484-0152 http://www.aempower.com Instruction Part Number: 10-5131 Rev 04  2009 AEM Performance Electronics 
 
Part Number 30-5131  
Analog EGT Gauge 
Figure 1.  Wiring Schematic 
AEM EGT Gauge Parts 
1 x 35-5131(B/W)  EGT Gauge Assembly  
1 x 30-2065 EGT Sensor Thermocouple w/Mount 
1 x 35-4302 Install Kit (6 Butt Connectors) 
1 x 10-5131 Installation Instructions 
1 x 35-3411 8-Pin Power Harness 
1 x 35-3414 2-Pin Sensor Harness 
1 x 35-8529S Silver Bezel 
1 x 6” Heat Shrink 
2 x 4-40 Hex Nut 
2 x 4-40 Screw  
						

							Page 2 
INSTALLATION 
 
1. Disconnect the negative battery cable. 
2. Secure the gauge in a 2 1/16th” (52MM) mounting hole with the supplied bracket. 
3. Plug the 8-wire power harness into the mating connector on the back of the 
gauge and connect the wires as shown in Figure 1.  Note: the locating tabs on 
the side of the connector should be nearest the center of the gauge. 
4. Connect the sensor cable to the gauge.  The locating tabs should be closest to 
the center of the gauge. 
5. Mount the thermocouple as shown in figure 2. 
6. Slide the heat shrink tube over the sensor cable and connect the thermocouple to 
the cable as shown below in figure 3. 
 
 
RED - Connect BOTH RED wires to a constant 12 volt power source utilizing a 5A fuse. 
 
BLACK – Connect BOTH BLACK wires to a clean ground. 
 
PINK - Connect to a switched 12 volt power source utilizing a 5A fuse. 
 
GREY - Connect to instrument lighting circuit supply voltage. 
  
*WHITE - Connect to Analog + Input. 
 
*BROWN - Connect to Analog – input. (Must be connected if Analog + is used) 
 
*optional – only needed if using the available differential analog output  
 
Wiring notes: 
 RED - When wired as shown above, the gauge will park the needle upon 
powering down.  Alternatively, both RED wires can be connected to a switched, fused 
12 volt power source.  With both RED wires and the PINK wire connected to switched 
power, the needle will remain at its current position upon powering down.  For both 
power connection methods, the needle will rotate to the parked position before rotating 
to the value of the current operating condition upon powering up. 
 GREY – The GREY wire is used to control the lighting intensity of the gauge.  
Maximum lighting intensity is achieved when the GREY wire is connected to 12 volts.  
Minimum lighting intensity is achieved when the GREY wire is not connected.  The 
instrumentation illumination on many vehicles is controlled by varying the supply voltage 
to the instrument panel lights.  When the GREY wire is connected to the instrument 
panel supply voltage, the intensity of the gauge is controlled by the dimmer switch on 
the dash. 
 WHITE – The WHITE wire should be connected to the Analog + input on the 
EMS or the analog + input on a similar device. 
 BROWN – The BROWN wire should be connected to the Analog – input.  If the 
EMS or similar device does not have a – input, the BROWN wire should be connected 
to a sensor ground.  If no sensor ground is available, the BROWN wire should be 
connected to a power ground.  Note: The BROWN wire must be connected in order 
to get correct readings from the analog output. 
 
  
						

							Page 3 
 Thermocouple Mounting 
 
The thermocouple included in the kit comes with a stainless steel compression style 
mounting adapter.  The mounting adapter consists of three pieces:  compression nut, 
ferrule sleeve, threaded body.  The threaded body has 1/8” NPT male threads.  To 
install the sensor, the threaded body can either be threaded into a hole with mating 1/8” 
NPT threads, or welded to the pipe/manifold.   Remove the compression nut, ferrule 
sleeve, and thermocouple from the threaded body.   For a welded installation, drill a 
13/32” hole and weld the threaded body, being careful not to cause any distortion.  .  
For a threaded installation, either thread the body into an existing hole with 1/8” NPT 
threads or drill a hole using an “R” size drill bit and cut the threads using a 1/8” NPT tap.  
With the compression nut and ferrule sleeve on the thermocouple, insert the 
thermocouple into the threaded body so the tip of the thermocouple is near the center of 
the pipe/manifold and tighten the compression nut to the threaded body. 
 
 
 
 
 
Connecting the Thermocouple 
 
Slide the supplied heat shrink onto the sensor cable.  Connect the RED wire from the 
thermocouple to the RED wire on the harness and the YELLOW wire from the 
thermocouple to the YELLOW wire on the harness using the supplied 4-40 screws and 
hex nuts.  Make sure the connections are not touching.  Center the heat shrink over the 
connections and apply mild heat to the heat shrink until it shrinks over the connections. 
 
 
 
 
 
FERRULE SLEEVE 
COMPRESSION NUT 
THREADED BODY 
PIPE/MANIFOLD 
WITH 1/8” NPT 
THREADS OR 
13/32” HOLE 
TIP OF THERMOCOUPLE 
NEAR CENTER OF 
PIPE/MANIFOLD 
HEAT SHRINK 
Figure 3.  Thermocouple to Cable Connection 
Figure 2.  Thermocouple Mounting  
						

							Page 4 
 
Changing the Bezel 
 
The AEM Analog EGT Gauge comes with the black bezel installed.  However, a silver 
bezel is also included in the gauge kit.  To change the bezel, orient the gauge so you 
are looking at the faceplate.  Rotate the bezel counter-clockwise to unscrew it from the 
gauge cup.  The bezel,  lens, and rubber spacer are all removable.  Reassemble the 
gauge as shown below in Figure 4.  Do not over tighten the bezel when 
reassembling the gauge.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Backlighting 
 
The AEM Analog EGT Gauge has 7 different backlight colors available to the end user, 
which closely match some of the more common factory dash panels: white, blue, green, 
red, orange, light blue, and aqua.   To change the backlight color, rotate the backlighting 
switch using a small precision style screwdriver.  The backlight switch is accessed 
through the small hole in the back of the gauge.  See Figure 5. 
 
 
 
 
 
 
Figure 4.  Changing Bezels 
Figure 5.  Backlighting Adjustment 
 ACCESS  
 PORT 
BEZEL 
LENS 
RUBBER 
SPACER  
						

							Page 5 
Status Lights 
 
The AEM Analog EGT Gauge has one status light, see Figure 6.  The status light will 
flash whenever the sensor is disconnected.   
 
 
 
 
 
 
Analog Output 
 
The analog output from the AEM Analog EGT gauge is a linear dc voltage signal that 
varies from 0.5 Vdc at 0 Degrees Fahrenheit (-18 Degrees Celsius) to 4.5Vdc at 
1800 Degrees Fahrenheit (982 Degrees Celsius) over the operating range of the 
gauge.  The signal is used for sending information to a data logger or an engine 
management system like the AEM EMS or F/IC.  The transfer functions for the analog 
output are listed below in Degrees Fahrenheit and Degrees Celsius.   
 
Temperature (Degrees Fahrenheit) = 450 * Voltage - 225 
 
For example, if the output is 2.5 Vdc, the temperature is 900 Degrees Fahrenheit. 
 
450 * 2.5 – 225 = 900 Degrees Fahrenheit 
 
Temperature (Degrees Celsius) = 250 * Voltage – 143 
 
For example, if the output is 2.5 Vdc, the temperature is 482 Degrees Celsius. 
 
250 * 2.5 – 143 = 482 Degrees Celsius 
 
 
A list of output voltages and corresponding temperatures is shown below in Table 1. 
 
 
 
 
 
Figure 6.  Illuminated Status Light 
Error 
Status 
Light  
						

							Page 6 
VOLTAGE °F °C 
0.50 0 -18 
0.75 113 45 
1.00 225 107 
1.25 338 170 
1.50 450 232 
1.75 563 295 
2.00 675 357 
2.25 788 420 
2.50 900 482 
2.75 1013 545 
3.00 1125 607 
3.25 1238 670 
3.50 1350 732 
3.75 1463 795 
4.00 1575 857 
4.25 1688 920 
4.50 1800 982 
 
 
 
Connector Pinouts 
 
 The pinouts for the 3-pin sensor harness and 8 pin power harness are provided 
below in Figure 6. 
 
 
 
 
 
Specifications 
 
Gauge 
Supply Current  
						

							Page 7 
 
NOTES: 
If  further  tuning  help  is  needed  be  sure  to  visit  the  video  gallery or  performance  electronics 
forum at www.aempower.com for comprehensive instructional videos and information. 
 
 
Replacement EGT Gauge Components 
 
30-2065 K-Type Thermocouple with Bung 
35-3411 8-Pin Power Harness 
35-3414 3-Pin Sensor Harness 
 
12 MONTH LIMITED WARRANTY  Advanced Engine Management Inc. warrants to the consumer that all AEM High Performance products will  be free from defects in material  and  workmanship  for  a  period  of  twelve  (12)  months  from  date  of  the  original  purchase.  Products  that  fail  within  this  12-month warranty period will be repaired or replaced at AEM’s option, when determined by AEM that the product failed due to defects in  material  or  workmanship.  This  warranty  is  limited  to  the  repair  or  replacement  of  the  AEM  part.  In  no  event  shall  this  warranty exceed  the  original  purchase  price  of the AEM  part  nor shall AEM be  responsible  for  special,  incidental  or consequential  damages or  cost  incurred  due  to  the failure of  this  product.   Warranty  claims to  AEM must  be  transportation  prepaid  and  accompanied  with dated  proof  of  purchase.  This  warranty  applies  only  to  the  original  purchaser  of  product  and  is  non-transferable.  All  implied warranties  shall  be  limited  in  duration  to  the  said  12  month  warranty  period.  Improper  use  or  installation,  accident,  abuse, unauthorized repairs or alterations voids this warranty. AEM disclaims any liability for consequential damages due to breach of any written  or  implied  warranty  on  all  products  manufactured  by  AEM.  Warranty  returns  will  only  be  accepted  by  AEM  when accompanied by a valid Return Goods Authorization (RGA) number.  Product must be received by AEM within 30 days of the date the RGA is issued.  Please note that before AEM can issue an RGA for any product, it is first necessary for the installer or end user to contact the AEM Performance Electronics tech line at 1-800-423-0046 to discuss the problem.  Most issues can be resolved over the phone.  Under no circumstances should a system be returned or a RGA requested before the above process transpires.  
Need additional help?  Contact the AEM Performance Electronics tech department at  
1-800-423-0046 or [email protected], or visit the AEM Performance Electronics 
forum at http://forum.aempower.com/forum/