Transmission temperature gauge

[okanagan]

Anyone ever install a transmission temperature gauge?  So far I can't find any metric adapters (M12 x 1.25) for the drain.  I guess there's always the option of drilling and tapping the existing drain plug for a 1/8"  NPT sending unit.

[Sjackson2]

This kind of adapter? https://www.amazon.com/Pipe-Female-M12X1-25-Metric-Adapter/dp/B078Z98GF2/ref=asc_df_B078Z98GF2/?tag=hyprod-20&linkCode=df0&hvadid=312430092407&hvpos=1o5&hvnetw=g&hvrand=16644118257186902106&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9030156&hvtargid=pla-570041607106&psc=1

[Mr_Reverse]

I just put a T in my cooler line and installed the sensor there. It is the outlet from the trans so pretty close to what the trans temp is. 

[okanagan]

Thanks for the suggestions.

[Mrelcocko]

I just put a T in my cooler line and installed the sensor there. It is the outlet from the trans so pretty close to what the trans temp is. 

Where would the cooler line be? I know it's coming from the front of the engine or I think I do so if it is coming from the front and you're sitting in the rig would it be on the left right front or back side of the transmission? I want to install one as well.

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[Mr_Reverse]

I don't recall exactly with the R50, but my WD21 has the hard lines on the right side of the trans and engine. I simply put my T in where the rubber hose is between the hard lines and the cooler. Since my trans temp gauge is an autometer electric one, I did have to run a ground wire to the T, as well as the sensor wire.