>>96540663
Tell them that you're running GURPS. If you run it, they will play. If they're worth playing with, anyhow. If they complain, ask them what problem they have with it. If the answer is just "We know D&D and don't want to try something new", then I don't know how much convincing can be done.
>>96541427
Depending on the tone your GM is going for, various electrical doodads (transistors, relay boards, amplifier circuits, etc) to make repairs to salvaged items would be both useful and fun - by conveniently having the right material for the job, you can turn a Gizmo and some scrap into a real Gadget!