The maaseh behind it
The mekor of the segulah is in sefer Vayizra Yitzchok and in many seforim. And it is brought in sefer Sifsei Tzaddikim in the name of the Mahariach"v that davening at his tziyun hakadosh is a segulah bedukah for a zivug as well.
The tziyun of the Tanna Reb Yehuda bar Ilai, who was poor his whole life — which is why davening there works specifically for parnassah.
Parnassah berevach, and a zivug
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Tell me who to say Tehillim for and at which tziyun, and I'll arrange it — a shliach at the tziyun, and you'll hear from him when he's there.