Tin vs gold — same wire range
The 963904-1: Both accept 17-20 AWG wire and use the same crimp tooling — the plating choice affects mating cycle life, not the wire range or the applicator setup.
Mating receptacle and housing
The 963904-1 mates with Micro Timer II socket contacts 964263-2 and 964274-2, both tin-plated and accepting the same 17-20 AWG wire range. The tab contact inserts into a Micro Timer II housing; the housing provides the primary latch and the terminal position assurance (TPA) retainer.