Tacky? Nah. No way! It fits the car. My Dad works at a company that owns, among other fine car dealerships, the largest North American Ferarri dealership in the US and I have seen the "red heads" a lot. It looks great in your car, as well as in the real Ferarris. Your car is over the top, why not the red head ? Just looking at the font fender, in your picture; at the curves, I think "Ahhh, the way they made cars in the late fifties & sixties." It must be cool to drive that thing. I like the head cover.
Iv'e seen pictures your car before. The bodywork is the work of an artist. The red headcover just compliments everything else. But, then, I'm a Ferarri lover as well as a Datsun lover. A Ferarri lover with the budget of a Dasun lover.