Valkyrie

I am need of a new one, since the wire broke off on mine.

Will an FC sensor work? Mine is hooked up with a blade connector, anyway, so I don't care if it has the right plastic part...

Are there any decent, cheaper 3rd party alternatives?

Is this basically junk?

R-R-Rx7

iTrader: (24)

https://www.rhdjapan.com/mazda-oem-w...nsor-fd3s.html

its 50bucks here + shipping from japan

i have seen other shops carry it in the us ranging from 90 to 110$

I recently bought the one from amazon for a different purpose to experiment on something else. It may work assuming that the connector is changed
i can check whether the thread is the same but at the end of the day you are not saving anything substantial to switch to the fc sensor

j9fd3s

iTrader: (3)

the FB part used to be the cheapest, 8553-15-610B its the same except it uses a bullet style connector instead of the FC and FD spade
gasket is 8553-15-611

obviously check the price on the FD part N3A1-15-610A, and a bullet connector and see which option works better

Valkyrie

The SA/FB version indeed is the cheapest, it seems. I found them all on Monotaro.
The FC version is at least cheaper than the FD version.

DaleClark

iTrader: (55)

I think they are all basically the same save the connector. It's a very simple switch, just grounds when it touches coolant, that's it.

Dale