What size is water temp sender for gauge on 504? metric?

The sender for my gauge is broke. I see i can buy the whole kit for $150 or so but im not that interest in spending that much everytime it breaks. What size is the fine thread or metric sending unit that comes from the factory? It's in a bushing, but the bushing is pretty much not removable from the water neck without breaking it but i have sending unit and probe out. 3/8" pipe thread or whatever is standard on a $10 gauge is too small and the other bushing in the kit is too big.
 
The original bushing threads into pipe threads. Removing it with a square shank or spline (not spiral)"Easy Out" Northern Tool Performance Tool Bolt Extractors — 5-Pc. Set, Model# W80635 or Craftsman 5 pc. Screw Extractor Set
Sold by Sears Sears Item# 00952315000 Model# 52315
The only other suggestion is to take the fitting you removed to a good hardware store, and match it up with a bushing component from a selection on faucet components. Jim
 

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