I just hooked up 3 old ASICs to a pool that signals Segwit

I guess it's just symbolic, because these machines are really old: two Butterfly Labs machines and an Antminer S1. The cost of energy will be a lot higher than the Satoshis they'll mine. But what the heck, mining is for supporting the network anyway. I suggest everyone does that. Dust off your old ASICs and support pools that signal Segwit.