My tach would keep jumping around erraticly and it would kick me in and out of overdrive and lockup. Unless i was at 70-75 then it would run fine if the rpms were above 2k. Now today the tach stoped working all together and all my gauge cluster lights will flash on and off and it wont **** into overdrive or lockup at all. Any ideas what the problem could be would help alot thanks.