I was laying with the TAG while out at the trailer today and found that I can indeed manually input weather data to store a run.

So, if needed, I could go back and enter all my previous runs with the weather at that time into the TAG.

However, we're getting a little off topic. Using the TAG isn't the concern so much as HOW I should use it?

Will it give ET predictions more accurately for alcohol cars in VP mode?

When using a TAG reading VP is that basically the same or equal to reading and using water grains?