How to install various gauges?
Thread Starter
Racer
Joined: Aug 2004
Posts: 315
Likes: 0
From: Schaumburg Illinois
How to install various gauges?
I just picked up an Autometer electronic trans. temp gauge and mechanical vacuum gauge. I was wonder what the best way to install these gauges is on a 1999 FRC. Any info would be appreciated.
*EDIT*
Sorry I wasn't very clear...What I was looking for was tips on where to wire up the illumination and how/where to tap in to to get trans. temp and a vacuum reading.
*EDIT*
Sorry I wasn't very clear...What I was looking for was tips on where to wire up the illumination and how/where to tap in to to get trans. temp and a vacuum reading.
Last edited by OneHottLS1; Jul 17, 2005 at 05:37 AM.
Safety Car
Joined: Nov 2003
Posts: 4,979
Likes: 5
From: San Diego, CA "leaf" "tee" "e"
The tranny has no temp sensor, so you're going to have to install one. Unless there's a sensor that mounts in the drain plug hole, you're pretty much out of luck...unless you install a tranny cooler, then you have more options.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
In the A4, the tranny fluid temp sensor is part of the tranny fluid pressure manual valve position switch. I suspect it is tapped through the main A4 tranny 20-pin connector. The Z06 and export 6-speeds have a temp sensor alarm switch which indicates overtemps on the DIC. That sensor replaces fluid fill plug on the manual tranny. Here's a more complete description from the manual:
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases and as the temperature decreases, the resistance increases.
The PCM supplies a 5-volt reference signal to the TFT sensor and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases. Refer to TFT Sensor Specifications for a complete comparison of sensor resistance, temperature and signal voltage.
Here's an illustration of the manual tranny sensor.
The schematic of the A4's integral sensors.
You should be able to tap off of the vacuum line near the brake booster for your mechanical vacuum gauge.
The automatic transmission fluid temperature (TFT) sensor is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFT sensor is a resistor, or thermistor, which changes value based on temperature. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases and as the temperature decreases, the resistance increases.
The PCM supplies a 5-volt reference signal to the TFT sensor and measures the voltage drop in the circuit. When the transmission fluid is cold, the sensor resistance is high and the PCM detects high signal voltage. As the fluid temperature warms to a normal operating temperature, the resistance becomes less and the signal voltage decreases. Refer to TFT Sensor Specifications for a complete comparison of sensor resistance, temperature and signal voltage.
Here's an illustration of the manual tranny sensor.
The schematic of the A4's integral sensors.
You should be able to tap off of the vacuum line near the brake booster for your mechanical vacuum gauge.
