Hello Anthony,
please see answers below.
1) How does the single port on MPXHZ6130AC6U affect its performance compared to that of MPXHZ6130A6U? Are these two functionally equivalent?
[A] The two pressure sensors are functionally equivalent. The MPXHZ6130AC6U has an advantage of an output port with possibility to connect a hose to the port. Disadvantage is the height.
2) Is there a height clearance recommended for the single port for MPXHZ6130AC6U?
[A] We don't have a clearance recommended for the port. It must be left open to be able to measure the ambient pressure.
3) Is there a replacement recommended by MFG for MPXHZ6130A6U that has similar tolerances or tighter?
[A] We have a MPXHZ6116A6U drop in replacement for the MPXHZ6130A6U if the height is important for your application and the MPXHZ6130A6U is not available, you can consider to use the MPXHZ6116A6U. Is has a smaller Vfss and it has a smaller pressure range. Measures pressure from 20kPa to 115kPa. Please find a datasheet attached.
With Best Regards,
Jozef