Django: How to update related model fields when creating model

Django 1.11

I have multiple models that have the same fields as status, for example repairOrder, statusUpdate which have an odometer field just as status does. When a user makes a new statusupdate or repairOrder I would like it to update certain fields within the status model as well. The way I see it there are four options

1. overriding the save() method on statusupdate
2. using signals
3. custom model manager, which could query for related models and update fields
4. a method on the model that would call the related model and update where I wanted it to.

I've removed some fields to make the example more simple.

class Status(models.Model):
     odometer = models.IntegerField()
     vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
     ...

class statusUpdate(models.Model):
     odometer = models.IntegerField()
     vehicle = models.ForeignKey(Vehicle, on_delete=models.CASCADE)
     ...

When a user creates a new stautsUpdate, I would like the odometer on Status to be set aswell.

Q: What would be the Django way of updating a related model's fields?

EDIT: Edited alot of the question to clarify the issue