If you get the Wholesale Automatics trans temp gauge they will supply you with a trans banjo bolt that has a short VDO temp sensor in it. This banjo bolt replaces the banjo bolt on the right side of the trans.
All your mechanic needs to do is remove that banjo and fit the other with the temp sensor in its place with 2 new 14mm copper washers.
You will lose almost nothing in fluid.
There's a single wire that then needs to come down through the tunnel above the trans.
A mechanic who can't do that should shut up shop..
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