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I'm installing an Auto Meter water temp gauge and didn't receive an adapter with it. Anyone know the thread size of the stock coolant temp sender on a B16A2 engine? (Single wire)... I was going to do a T fitting on the upper rad hose, but I can't find a 1.25 T fitting with a -27 NPT top.

You can't splice into stock wire because values are different and it will ground out. I've been searching everywhere to no avail.

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I hate dealing with adding aftermarket parts and dealing with sizes.

Here's the replacement Duralast Coolant Temperature Sensor for your vehicle and engine. In the description, it says it's thread is M12 x 1.5 Thread. The ValuCraft brand version agrees about the size.

Good luck!

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