Bruce,

Do you have a PFC or a manipulation of indicators that will produce  the Chaikin

Relative Stength indicator?

I do not know of a way to do so (or even specifically how it is calculated to return a value between 0 and 100).

You could try adding a plain Relative Strength indicator to the chart with the Relative Strength symbol set to SP-500 or SPY.

Adding a 126-period Rate of Change % indicator to the chart and changing its Data Source to use the plain Relative Strength indicator could give you an idea of the performance over 6 months on a daily chart.

You could try converting the value to a 1 to 100 by adding a stochastic or Relative Strength Index indicator to the chart and change the Data Source to use the plain Relative Strength indicator. Again, setting the Period to 126 would cover a period of about 6 months on a daily chart. That said, I have no idea what method is used in the actual indicator to convert the relative strength to a 0 to 100 range covering 6 months.