What size thread is the stock water temperature sender? Honda CX500, CX650, GL500, GL650

The standard temperature gauge has a sender which is located underneath the thermostat, between the engine heads. What thread size is it?

What size thread is the water temp sender on a Honda CX or GL motorcycle? Here's a photo of the sender itself.

It’s M16 x 1.5 thread. Adapters are readily available for most modern sizes of sender on eBay.

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