Instrument panel not showing battery charging nows come? on 1995 Cadillac Seville SLS

I installed a new starter and an alternator. Had to move wiring and disconnect several items in order to remove intake manifold to change starter. Volt meter shows alternator is charging but panel shows zero battery volts. fuel gauge does not show level. chime rings when lights are turned on. Had to disconnect and reconnect multi cable supplying injectors. Suggestions to correct

Asked by for the 1995 Cadillac Seville SLS