i was using tunercat to caliberate my speedo for my th350 swap, and now the speedo is non functioning at lower speeds, and somewhere near double actual speed (or more) once you get moving over 35. and around the same time the tach quit working. it still flinches when you turn the key on, and data master is still getting a tach feed, but it stays right around 4-500 when driving. any help would be appreciated. thank you prorac1