manual oil gauge tee

Does anyone make a 3/8" (I think that's the size of the sender for a slant) flex hose that will stand up to the pressure & heat so you could maybe mount a tee on the firewall?
This is what I plan on using for my 360 in my 72 Van. They have 3 and 4 foot ones if you look.
New - 4 Steel Braided Pressure Gauge Line Kit For Oil Water Fuel Gauges 72" Inch | eBay