Speedo cable replacement - 92 Pathfinder

Hey, I’m trying to replace the speedometer cable, housing and all, on my '92 Nissan Pathfinder. I have detached it from the transmission and instrument cluster but can’t see to fit the bulky plastic end through my firewall. Any tips on how to get it out and how to get the new one in?

I tried to replace just the cable itself, but its solidly stuck in the old housing. That’s why I’m trying to replace everything.

Any help will be greatly appreciated!