Yup, I called Don Docksteader this morning. I guess this is the simplest option. I could tap it, but I like the idea of having the nut head on it too.
I called Greenline, they could make one but it would be like 2" long...
Shipping from SGP kills the deal.
Note for ppl... be careful to check if the thread on your sender is NPT or BSPT. Ie. Greddy is BSPT where as I think Defi is NPT. The Subaru Gallery plug is BSPT. I think the Prosport Adapter Plug is NPT.
Front Gallery Plug (with hole for the OEM sensor) # 11024AA210 $13
Gasket # 037018200
If anyone has any other good info just add it below