I have a 4T65E and was wondering has anyone used a stand alone gauge for the trans temperature and how did you hook it up?
I want to get, I think a Glowshift gauge but it comes with a sensor that screws into the tranny in a port but since the 4T65E has an internal
sensor I`m not sure how to get the right signal to the gauge.

I used the stock Temp gauge in the dash, with a toggle switch to go back and forth between coolant temp and trans temp. I've done this on two cars now ( el camino and Fiero) and it works pretty well. I use the same temp sensor that is used on the engine, so that the resistance matches for the gauge. Just need to plumb in the sensor in the trans coolant line, and use a relay to switch the signal. A bonus is that using a Fiero sender will also give you a ground signal for a "Hot Trans" light should you want to include that as well.

Parts you will need:
Cooler(optional) , if you like mine ( Cadillac '09 STS).
http://www.ebay.com/itm/New...ool...2c6030&vxp=mtr
Switch with/ LED
5 pin relay
Temp Sender WT414
Sender pigtail PT 197 or 84032
3/8" brass tee
2 3/8" Barb'd fittings for the size rubber line your cooler uses.
Teflon tape is always a good idea. Don't use it on the sender.
Ground wire from the sender to ground. Since I installed the sender in the cooler, I just grounded the cooler.

I used a rocker switch with an LED indicator on it, to let me know when I was "switch'd" to trans temp.
This switch then transmits 12V positive to a stock auto relay, causing the relay to cycle. The relay then moves from transmitting the stock sender's signal, which is it's normal state, to transmitting the Trans Temp signal. Turn the switch off, the relay disengages, and the stock water temp signal is now sent to the gauge.

The wire that comes from the stock Coolant sender goes to terminal 87a of the relay (D3 of C500. I've done the temp gauge fix on mine, so check your wiring). The output to the gauge goes from terminal 30 of the relay back to D3-of c500, and then to the gauge. The wire from the sender you installed in the trans line goes to pin 87 of the relay, and 12V comes from the switch in the cab to pin 86. Pin 85 goes to a convenient nearby ground.

For me, the sender was installed using a brass 3/8 npt tee. You can use Barb'd fitting on both ends of the tee for your line, or use some other configuration that matches your setup. In my case, the cooler took 3/8" flared fittings, so I used that on one end of the Tee, and a barb'd fitting on the other end. Be sure to ground either the "tee" or the cooler ( if the tee is mounted into the cooler). The sender must have a ground to work.

Here's a thread I did on another site.

http://www.elcaminocentral....0649&highlight=trans

Wiring Diagram
http://i300.photobucket.com...tion_zps52ifaawc.png

HTH

------------------
'87 GT , '00 3800 Series II SC, 4t65e, Vue Power Steering.

quote Originally posted by darbysan: I used the stock Temp gauge in the dash, with a toggle switch to go back and forth between coolant temp and trans temp. I've done this on two cars now ( el camino and Fiero) and it works pretty well. I use the same temp sensor that is used on the engine, so that the resistance matches for the gauge. Just need to plumb in the sensor in the trans coolant line, and use a relay to switch the signal. A bonus is that using a Fiero sender will also give you a ground signal for a "Hot Trans" light should you want to include that as well. Parts you will need: Cooler(optional) , if you like mine ( Cadillac '09 STS). http://www.ebay.com/itm/New...ool...2c6030&vxp=mtr Switch with/ LED 5 pin relay Temp Sender WT414 Sender pigtail PT 197 or 84032 3/8" brass tee 2 3/8" Barb'd fittings for the size rubber line your cooler uses. Teflon tape is always a good idea. Don't use it on the sender. Ground wire from the sender to ground. Since I installed the sender in the cooler, I just grounded the cooler. I used a rocker switch with an LED indicator on it, to let me know when I was "switch'd" to trans temp. This switch then transmits 12V positive to a stock auto relay, causing the relay to cycle. The relay then moves from transmitting the stock sender's signal, which is it's normal state, to transmitting the Trans Temp signal. Turn the switch off, the relay disengages, and the stock water temp signal is now sent to the gauge. The wire that comes from the stock Coolant sender goes to terminal 87a of the relay (D3 of C500. I've done the temp gauge fix on mine, so check your wiring). The output to the gauge goes from terminal 30 of the relay back to D3-of c500, and then to the gauge. The wire from the sender you installed in the trans line goes to pin 87 of the relay, and 12V comes from the switch in the cab to pin 86. Pin 85 goes to a convenient nearby ground. For me, the sender was installed using a brass 3/8 npt tee. You can use Barb'd fitting on both ends of the tee for your line, or use some other configuration that matches your setup. In my case, the cooler took 3/8" flared fittings, so I used that on one end of the Tee, and a barb'd fitting on the other end. Be sure to ground either the "tee" or the cooler ( if the tee is mounted into the cooler). The sender must have a ground to work. Here's a thread I did on another site. http://www.elcaminocentral....0649&highlight=trans Wiring Diagram http://i300.photobucket.com...tion_zps52ifaawc.png HTH

I appreciate the info.
I was hoping to be able to just come out of the OBD port and directly to a gauge.
I have solid transmission lines except right at the transmission where I have crimped fittings on hydraulic hose so I don`t really have a place to insert a T.
Thanks

Very ingenious idea Darbysan.

I think I will eventually get the Aeroforce pod mounted gauge that plugs directly into the OBD port.
Thanks to Mstngs for leading me to that gauge.
A little pricey but it has a lot on it.

I use my iPhone with Dash command or you can use torque pro on an android. Using a Bluetooth or wifi device for under $10 that plugs into your obd port opens up all kinds of sensors and options.

quote Originally posted by JCircs: I use my iPhone with Dash command or you can use torque pro on an android. Using a Bluetooth or wifi device for under $10 that plugs into your obd port opens up all kinds of sensors and options.

I have dash command with an iphone now, I just want something that is more permanent.
My phone sometimes has a hard time linking to the wifi adapter.

A related option:
On a car I thought I might add one to, one that I added a higher stall converter too, (not Fiero) I instead drove around in various situations and checked the pan temp in various places multiple times off and on with a $25 infrared temp reader and saw that it didn't get near hot enough to be an issue. So decided against putting in a gauge. I do have two small coolers in line though mounted in front of the radiator and don't have it running through the radiator (as that only heats it up to temp faster).

There are differing opinions, and your mileage may vary.

[This message has been edited by 2.5 (edited 04-19-2017).]