Anyone know of a device to correct the speedo on our trucks? I know the superchips programmer I had would program the speedo. But you had to load a tune. I'm not going to run any programmers on my truck anymore. Is there a speedo "programmer" or something like a motorcyclists use on bikes called a yellow box (device that is installed inline after the speedo pickup that manipulates the signal frequency to speed up or slow down for compensation) ?