Trans Temp Gauge Installation

A transmission temperature gauge of your choice an be purchased from most speed shops or PartsForYourCar.Com. The type of gauge is irrelevant, you can choose whichever you like the best.

Tools Needed:

2 Crimp Connectors (for gauge lights)
4 ring terminals
Wire cutter/crimper
11mm socket
11mm deepwell socket

You will need to decide the location to mount the gauge, but an A-pillar gauge mount is available as a professional location to mount two gauges. has a 2 & 3 gauge pod available

Begin by locating the line pressure tap plug located on the right front section of the transmission.  The easiest way to get access to this plug is to safely jack up the front end of your car or drive your car up on a set of ramps.  Then remove the plastic shroud exposing the test port.  Using a ratchet (you may need a "wobble" socket too), remove the tap plug and set aside.  Make sure you have a shop towel or small bucket under the test port plug because some tranny fluid will come out.  When I removed my test port plug less than a shot glass of tranny fluid came out.  **This is also a good time to inspect the quality of your tranny fluid (based on color & smell).

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(line pressure test plug)

Install the provided sending unit into the threaded port as shown below. The small copper-colored sender with the blue wire is what we're looking at here:

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Install the signal wire and route it securely away from the transmission.  Next, run the signal wire into the passenger cabin. There is a wire harness that runs through the firewall just to the left of the steering column that is a good location for this wire.
Run the wire to the signal input of the transmission temperature gauge inside the cabin and supply a switched power source for the backlight.  

Click here for gauge lighting instructions


Don't forget to hook up 12V power. Why do you need 12V power? Because the gauge is an electrical gauge, not mechanical. But I already hooked up my gauge lighting - isn't that good enough? No - the power for the lamp is used only for the lamp. The gauge needs an electrical signal that's not variable (unlike the dimmer you already hooked up - it's not always 12V and varies with a turn of the dimmer dial) so that it converts the signal from the sender into a mechanical movement of the gauge needle. Here's how to do it:

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All that's left to do is to ground the gauge  and the gauge lamp

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Pictured below is a copy of the wiring diagram for the Autometer Transmission Temperature Gauge:

Questions? Email me & ask