after fixing battery connection problem on my 1994 bmw 325ic when car is started on 1994 BMW 325i

fuel gauge shows empty and temp shows hot

1 answer 2 comments
did you short battery cable when installing new battery?
I didn't actually change battery.Battery appeared to be dead but when I checked I found that the negative cable was loose so I just tightened it.Then when I started the car is when the gauges malfunctioned.
thats the same thing you lost pwr