So i bought a 03 cobra finally after years of wanting one. So i brought it back to the shop, adjusted the pivot ball that was wrong for the t56 magnum and fixed a bunch of wiring with the battery relocation. So the problem that im having is that the speedo and tach go crazy when i do a wide open pull. Basically they die and then when i let of after a second they go back to normal. The car runs good still when this happens. Could this be a ground issue or maybe and bad alternator? I removed the WOT box that was installed too and still the same issue.