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Old 12-08-2013, 04:13 PM
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Electrical Temp Gauge

Who has a good ( but inexpensive) electrical transmission temp gauge setup for a Buick th400. The Gauge itself - will be installed under the dash, so I can
keep an eye on it-while driving. From what I am hearing, the "mechanical --
plastic lines" ones break and leak fluids into the passenger area. Thanks JIM

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Old 12-08-2013, 05:21 PM
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Mechanical gauges that use a plastic line are for oil pressure, not for oil temp. A mechanical temp gauge uses a sealed copper tube.
I just installed an Autometer trans temp gauge in my truck. Works well, was about $60 with sending unit.

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Old 12-10-2013, 09:12 AM
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electrical transmission temp gauge

Poncho62 ---Do you have any pictures of your setup. My Idea is to put a "tee" fitting in the trans line, then attach the sending unit, which converts it over to electrical, and then send the wire(s) thru the firewall , to the under dash mounted trans. temp gauge.
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Old 12-10-2013, 12:09 PM
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Quote:
Originally Posted by jim owens View Post
Poncho62 ---Do you have any pictures of your setup. My Idea is to put a "tee" fitting in the trans line, then attach the sending unit, which converts it over to electrical, and then send the wire(s) thru the firewall , to the under dash mounted trans. temp gauge.
Do you mean the trans line to/from the radiator ?

I have an Auto Meter trans temp gauge, the sender is in the trans pan.


Fitting instructions.
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Old 12-10-2013, 12:57 PM
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Malc, --YES, Trans line to/from the radiator. I really didn't want to drill a hole in the side of my trans. pan, I would rather have it "inline" if at all possible. Did that sending unit come with the kit ? Do you have any problems with leaking fittings ?
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Old 12-10-2013, 04:09 PM
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I have a 4L60e trans in my truck....I put the sending unit in the pressure test port that is just above the shift linkage. I dont know if the T400 has this port. If you are going to "T" the line, make sure that you put it in the line going out of the trans. That will give you a more accurate reading of the temp in your trans.
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Old 12-10-2013, 11:42 PM
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Quote:
Originally Posted by jim owens View Post
Malc, --YES, Trans line to/from the radiator. I really didn't want to drill a hole in the side of my trans. pan, I would rather have it "inline" if at all possible. Did that sending unit come with the kit ? Do you have any problems with leaking fittings ?
The link tells you what is in the kit,
no problems with leaks.
And X2 for Poncho on the trans line out fitting.
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Old 12-11-2013, 05:14 AM
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I realize the trans pan what be the most accurate & ideal place to put the sending unit, but this is a 1969-70 TH400 from a Buick, which has no pressure test ports. The last option was to have a welder place a "bung port" in the trans pan. I was hoping to hear from some buick guys/gals who have already done this. JIM
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Old 12-11-2013, 07:50 AM
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Whatever vehicle the installation is pretty much the same.
I think you´re trying to narrow it down too much.
I see just the same amount of work installing a sender in the trans line as getting a bung in the pan.

Sorry we did´nt meet your requirements.
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Old 12-11-2013, 08:31 AM
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It Looks like this is really the only way to go, for ease of installation & accuracy, just trying to find another alternatives other than drilling holes in the trans. pan. JIM
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Old 12-11-2013, 12:04 PM
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Quote:
Originally Posted by jim owens View Post
I realize the trans pan what be the most accurate & ideal place to put the sending unit, but this is a 1969-70 TH400 from a Buick, which has no pressure test ports. The last option was to have a welder place a "bung port" in the trans pan. I was hoping to hear from some buick guys/gals who have already done this. JIM
I worked on my first T-400 in early 1970's... All the T-400 trans I have seen, have a pressure port on drivers side above the shifter shaft.

Cooler lines are incorrect location for proper temp reading
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Old 01-05-2014, 04:56 AM
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Another possiblilty I am looking into --- Is to install what is called an ''Trans temp. sending manifold" made by Autometer (# 2287). It is "blue block" made from aluminum with "ports" to accept a sending unit & the trans. line
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Old 01-05-2014, 06:05 AM
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Is your engine water temp gauge an after market unit? If so, a DPDT switch can be put in the wiring along with a temp sender similar to the one in the coolant in the pan or a Tee. This is how mine is installed. Is it the best place? Possibly not but it's probably within a couple of degrees of the outlet line:
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Old 01-23-2014, 02:18 AM
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Quote:
Originally Posted by jim owens View Post
It Looks like this is really the only way to go, for ease of installation & accuracy, just trying to find another alternatives other than drilling holes in the trans. pan. JIM
You should do as is recommended in the instructions coming with your gauge. The fluid temp varies between the pan and the pipes, a set-up meant to be used in the pan will not be as accurate if you mount it inline. Also, if you try to improvise, you will get many opinions about where to mount the sender: for instance, what is the real temp of the fluid inside the trans, the "hot" one in the out pipe, or the "cool" one coming from the cooler?
Unless the instructions say differently, trans pan is best, sorry!
Also, about the mechanical gauges, even if they do not leak, it can be a ***** to route a pipe (even soft) compared to a wire. And if for whatever reason you have to unplug your gauge (work on the dashboard...), the wire is also easier to deal with...
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Old 01-24-2014, 10:43 AM
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I have my sender in the out line from the trans exactly as you describe wanting. It is T'd into the line by transmission hose, NOT gas line, pcv or any other hose, and the wire runs up to the gauge from there.
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