Hello.
i have a w164.i drove it to the store, when I came back it could not engage the gear.and when I started the engine it gave me the warning vehicle not in P position.when I closed the door and switched the car off.after 10-15 seconds the dash came back on and had flickering every 10 seconds.The car starts so well.
I just replaced the ISM and when the diagnostic machine was put it gave the warning of the ism open circuit warning. But once the errors are cleared.it disappears however the flickering doesn’t.
guys what could be the issue.kindly assist

The flickering has had my fuel gauge not operating as well