Subject: Re: Historical SMA of SPX source?
There are many ways to skin the cat -

Option 1 - Download ^GSPC from Yahoo into a spreasheet -and compute the running mean in Excel - Average of last 200 days

Option 2 : Utilize GTR1s capabilities

http://gtr1.net/2013/?~SMA200:...

I think this is correct - just run the signal values ( download version) Backtest
and then click the Download report option.

it'll give you everything

All the best