A post like yours was made on TB a few years ago. It drew all manner of opinion, links to many right-angle fittings, but not one person who could say they actually had experience. Apparently there is a Volvo tool $$$ the ex-dealership mechanics used, and that was the only source of actual experience.
If I needed one, I'd try it. But it doesn't look like anyone else is going to say they have and lead the way for you. Buy it now!
My opinion on safety: If you use the stick gauge to measure pressure, activate the pumps bypassing the fuel relay, not with the motor running. And wear eye protection.

--
Art Benstein near Baltimore
Pilfered from Eric:
The Parts Man Prayer
I work behind the counter
In an auto parts store
Sometimes I'm called a genius
Sometimes I'm called much more.
I say I'm no mechanic
But when their job goes sick
Everyone comes in and asks me
What makes the damn thing tick.
I'm supposed to know the number
Of nuts and bolts and gears
For every machine ever made
For more than a hundred years.
I'm supposed to have the answer
For everything unknown
To every Tom, Dick, and Harry
For all their questions thrown.
My life would be a pleasure
And I'd grin from ear to ear
If only they would tell me
Their Model, Make, Year
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