There are two versions of the speedo - The Matrix Evo(NR90700) which has a normal top plate and comes with an optional heatsink in the box, and the Matrix ISTC (NR90750) which is supplied with a heatsink and fan installed. You can also get the Worlds Option Kit (NR92600) for the Matrix Evo which contains a heatsink similar to the one supplied with the ISTC speedo along with a fan.
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