Ref tables in a dashboard

I have 2 tables. a “lanes” table of 8 records and a referenced “readings” table which contains all the data for each of the 8 lanes.
I have a dashboard which has 3 views. #1 a table view of lanes. #2 a table view of the readings data for the selected lane. #3 a graph of the readings for the selected lane.
So far so very good.
My problem is that when I first load up the dashboard the data for all 8 lanes is rendered both in table #2 and in the graph - I need it to select the first lane automatically. Is there a way to do this does anyone know ?

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