History across two custom fields (Date & Value) and create Graph from this values


I have 2 custom fields, Audit date & Audit value. On a bi-weekly or monthly basis, users enter value in both the fields. For example:
Audit Date | Audit Value
1-Jan-2018 | 10
1-Feb-2018 | 20
1-Mar-2018 | 40
1-Apr-2018 | 60

Now I want to have this history of values across both fields, to display in similar table as shown above and also plot them graph, to show the trend of values across months. How do I achieve this? I tried to add Audit date as Dimension, but I kept getting an error. Any help would be helpful.