I thought that it was an electrical dampening that was different from the OP new gauge compared to the one in my VX. That is why I asked to see pictures of his and got his old gauge to try and modify it. But I couldn't see any difference in the 3 that I have looked at, 4 if you count the Rodeo in the scrap yard.

It does have an electrolytic capacitor in that circuit and I assume that it is there for dampening, but they are all the same.