My gages blink in and out while driving and the other day it flashed then when it came back (maybe 1 second) the speed read 295mph the tack read 10.?? something, fuel was blinking at 00 temp was blinking but was at norm. about 198 volts and oil pressure stayed normal did not blink. not the odometer reads 409100 . I stooped switched everything off and restarted the truck and everything works OK but gages still flash in and out and the odometer reads 409100 something now. I have it grounded the same place my in-line fuel pump is located and grounded. To the frame right below the passenger side door.