Water temp sending unit sizes
 

I just got my freshly rebuilt engine back from from Jesse Prather Racing and started putting everything back on the engine when I ran into an issue. The water temp sending unit from my old engine doesn't fit. It's to small. Did they make different water sending unit sizes? I must have a dozen rear irons and can't find a sending unit. Where would be a good place to pick one up?

Thanks

Eric

scroll down to bottom http://www.mazdatrix.com/79-85Electrical-Engine.htm

Thanks Jeff.

I just ordered the new sending unit. ~$30 + shipping, but got to have it.

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From MazdaTrix

Note: A few years ago MAZDA changed the thread on the water temp sender in the rear side housing from the straight thread that they had used forever, to a metric pipe thread. All NEW replacement rear side housings have the new thread. It is impossible to know which you have with out looking at it. Most cars still use the straight thread. However, if the engine has been replaced with a FACTORY rebuilt, there is a small chance you have the pipe thread. To identify the thread on your sender, look to see how it seals- the straight thread units use an aluminum crush washer and the pipe thread units do not.The new sender will not read correctly in pre-80 cars