How-do-I-connect-Wealth-Lab-to-my-brokerage-Fidelity

Unfortunately you can't with Fidelity. I suggest you write to their corporate office and ask for them to open up their API to wealth lab users. The more people they hear from the better. I wrote to their CFO.

I had to open up a TD Ameritrade account just to use with Wealth Lab 7.

You can't connect to Fidelity but Wealth-Lab 7 supports other brokers:

https://www.wealth-lab.com/extension/detail/InteractiveBrokers
https://www.wealth-lab.com/extension/detail/TDAmeritrade
https://www.wealth-lab.com/extension/detail/Alpaca
https://www.wealth-lab.com/extension/detail/Kraken

TD Ameritrade works great. What advantages would there be at Fidelity ?

Advantages of Fidelity - For the past 5 years I have 2 ROTH accounts, 2 Rollover IRA accounts and a SEP IRA and a trust account and joint account and charitable trust account and not interested in changing over.

Secondly, I have a very small TD Ameritrade account that I have not done anything with for the last couple of years. Fidelity has a vast array of fundamental data and stock screeners that I use extensively in researching stocks.

Translating Fidelity's reply on a data API question, they don't really seem to be interested:
https://www.wealth-lab.com/Discussion/Fidelity-response-for-a-Data-API-5824

You can still use WL7 and trade with Active Trader Pro. I do it everyday. Not a problem. What would be really nice is a COM interface into ATP that a broker extension for WL7 could hook into. Then you would have the best of all worlds since WL7 and ATP would play together.

If someone can convince Fidelity to add a COM interface to ATP, I'm willing to write the broker extension for WL7 to hook into that COM interface. Perhaps that might stimulate some interest.

I do all my trades with Fidelity Active Trader Pro through keyboard simulator. It took me a while to perfecting it, but it does the job.

What is the keyboard simulator?

Search in google for "Windows Input Simulator ".
in short, you make the code to generate key strokes (letters and numbers) as if you are typing them from the keyboard. Therefore, you can automate your trades.
For example, you can bring Fidelity "Trade" dialog by hitting CTRL-T. In code, you would do something like this:
Keyboard.ModifiedKeyStroke(VirtualKeyCode.CONTROL, VirtualKeyCode.VK_T);

Doing It requires good understanding of c# and win32. More challenging, Fidelity Trade dialog changes its fields depending on your setting, trade type, and account

I think getting Fidelity to add COM hooks into ATP so a WL brokerage extension can be written to employ those hooks would be much more powerful and a much cleaner solution than using a keyboard simulator hack.

One big advantage is that such a brokerage extension could easily bring potential buy candidates from WL7 into ATP to do some research on their fundamentals, future earning dates, and such before pulling the trigger as shown below in ATP.


Also, ATP has that "Trade Armor" facility to allow you to adjust WL7's "proposed" bracket order (i.e. limit and stop) prices to new values with sliders; see illustration.

ScottPlot is good, and ScottPlot can probably be used in conjunction with a building a WL brokerage extension (say to evaluate P/E ratio value), but ScottPlot won't let you put ActiveX controls (e.g. sliders) on a plot like ATP's Trade Armor can. That's a limitation. And the Trade Armor graphic does help you doctor (and troubleshoot) those proposed WL Limit/Stop orders.

Fidelity wants WL users to employ ATP to post their trades so they're better informed when making trading decisions. And adding a COM interface to ATP will help facilitate that goal.