I bought most of the stuff on Amazon, except the nipples and stainless Tee fitting.
Below is the reducing bushing to mount the gauge:
https://www.amazon.com/dp/B08LK55Z7T?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8
Below is the link to the Gauge:
https://www.amazon.com/dp/B0C5MKF7VY?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8
Below is the link for the Stainless Steel quick disconnects:
https://www.amazon.com/dp/B0C5P84NHN?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8
Below is the link to the Adapters to connect the quick disconnects to the 3/4" pipe thread. All of the quick disconnects that I found would only connect to a hose thread. So I needed to convert between the two types for both ends, so there's 2 links
https://www.amazon.com/dp/B08LK55Z7T?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8
https://www.amazon.com/dp/B0CP388L73?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_8
I used a bunch of 3/4" stainless nipples and a stainless tee that I picked up a Lowes or HD. I also installed quick connects on my potable water hose as well (
https://www.amazon.com/dp/B06Y4T5V52?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_5) As a general rule I don't usually mix metals, meaning I don't connect stainless steel to brass or vice versa. My water hose has brass fittings so I used brass quick connects. Is it a big deal if you mix metals, probably not, but I played it safe.
Lastly don't forget to use pipe dope of Teflon tape.
Have Fun!
Bob