I don't believe you can.
Looking at your image, I am surprised you have been asked to create a speedometer based on dates. There must be a better way of displaying the data - a line chart ?
However, have a look at the following link:
You can build a speedometer from scratch by copying the URL into your code and amending the parameters associated with it. This may get you want you want but it may not be that pretty.
A bit of a frig but you could multiply the value by minus 1 ?
Or I could sarcastically suggest that you stand on your head to view the speedo upside down which from that viewpoint would transpose left to right into right to left.
Finally many people I hold in high regard argue that speedo's are bad visualisation as they are confusing and take a lot of space.
Best Regards, Bill