I had one of these a LONG time ago. Mechwarrior 2 looked pretty cool through it. I can't for the life of me remember what the cables looked like, but you do need more gear than just the headset. From what I recall you not only needed a compatible video card, but it came with a special interface card that needed an ISA card slot. The video card plugged into the interface card, then the interface card plugged into the headset. Kind of like the old 3Dfx video accelerators if you're old enough to remember those.
So, unless you can find one of those (they called it a VIP card) and have a motherboard old enough to have an ISA slot then it's just a fancy hat
I wouldn't be too concerned though. While the head tracking part was backwards compatible (you could script it to the mouse or keyboard commands) it never worked well, and it only natively supported a few games. But I'll admit that when it did work it was pretty convincing.