As Ben said, guage, ECU, and the other I think is for some emmissions stuff... not a thermo. You only need the first 2 (guage one will be to suit your guage... probably a standard 18R-C item, second will be to suit your ECU, check with the manufacturer instructions). A third could be used for a thermo, but 99% of modern aftermarket ECUs will do this for you.
I'll go check my bolts, they have a 12mm head, and I think they are an M8 or M6, will check all that for you too.
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