[XC50077]

AU2 XR8, fitted new eagle plug leads and car seems to be running good but smartshield dash light flickers when starting and flashes quickly at idle and then increases flash speed in sync with revs. The tacho also stopped working but has rectified itself .Removed both battery leads for 3 minutes with no change. Battery is at 12.7 volts by gauge but not checked for actual voltage.
Any ideas on this appreciated. Cheers.