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I assume you have to solder before you stick the pins into the connector?

They are crimp connectors, but a bit of solder wouldn't hurt unless it makes the pin too big to fit into the hole. I soldered all of mine.

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And If I don't plan on having a serial or tuner, I don't need those pinouts?

Nope, I removed mine from my stock sled before installing it in my car to save room on the install.
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Mark Cushman