E30 Zone

I have a few questions so please be patient

Last week I noticed when I shut engine down and get the key out, rev counter needle settles at 500rpm
and when I try to start the car it goes back to 0?
any solution?

second...I hear some kind of vibration when driving cold car in fifth gear around 80kmh...it's not in the tunnel or bearings, just slight humming noise (diff checked)...not sure what is that either

third I got small water leak right under passenger side door trim...from where is this coming from?
black arrow marked on pic
http://i44.tinypic.com/2eg5kpl.jpg

thanks fellas

Rev. counter problem is the most common minor fault that occurs with the lithium battery powered SI boards. Doesn't cause any problems, and the only cure I know of is to fit a board that isn't faulty.
Vibration: ggod luck finding this, bur what happens if you knock the car out of gear when it's occuring?
Water leak: Are you sure the plastic sheet under the door card is sealed properly?

Brianmoooore wrote:Rev. counter problem is the most common minor fault that occurs with the lithium battery powered SI boards. Doesn't cause any problems, and the only cure I know of is to fit a board that isn't faulty.
Vibration: ggod luck finding this, bur what happens if you knock the car out of gear when it's occuring?
Water leak: Are you sure the plastic sheet under the door card is sealed properly?

Thanks Brian!
This is the second dash I fitted since I had already problem with this but that time everything stopped working...right now this is the only fault so I will keep it until again everything else dies, then I will source another one ;)
Vibration is gone when I hit it in neutral, I checked the driveshaft, center bearing was replaced two years ago and front guibo looks fine...actually vibration is very minor but when radio is off it can felt and I can hear light wibe...
I retrofitted leccy windows and sealed it properly...not sure, perhaps it's fell off