I don't know about yguns26, but a gear indicator on a bike/bike engined car, is a very useful thing. They're not overly blessed with torque, and have to be kept "on the boil", so knowing what gear you're in is a very useful thing.
In a bike engined car, the gear selection is sequential, as on the bike, so there isn't the H pattern to judge which gear you're in, which can be very frustrating. I know, I race one.