fan controller question

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There's the wiring diagram. Other than that you just have to set it to be a dual speed fan and everything works well. I recommend 200 on/195 off for low speed and 210 on/205 off for high speed with a 185 thermostat.
What are you using for a sender? Dakota? What size? I have an autometer mechanical in my aluminum housing and a thermoswitch for my.old.setup in the small port just to the left of that, but i cant seem to.locate the correct size sender from Dakota. Can you possibly clarify for me? Am ordering the controller relays and want add the sender in this order. Thanks