So after some continuity checks, and besides the obvious failure between filter and center terminal connector (white wire), I found there was no continuity between the metal center terminal and the wire that was connected to it. The conductor had corroded in the terminal swage. I managed to pull the plastic fittings off the terminals and rebuilt the entire cable harness back to what was there originally since the sensor and dash gauge used to work. Pictures below show failed conductor location and hints on terminal removal from the cable fittings. I used the original terminals and soldered the new cable splices to them. Gauge is reading pressure again. So glad I did not have to pull the instrument panel out.