I have a 1988 300E that I recently pulled the instrument panel to check my hall effect sensor as my cruise is working intermittently. I will solder the cruise brain as that is probably the problem. I must confess that I forgot to disconnect the battery cable. I don't know what happened but since I plugged the instrument cluster back in, the oil pressure and the tach are not working. Any ideas or suggestions. I checked all the fuses in fuse box with an ohm meter and they all seem to be fine.