I hope your dad hangs in there. Sounds like they are coming up with some better medications these days...if it's not already too late. Fingers crossed!
I'm curious what controls the injection on a manual setup? Seems I remember an episode of Wheeler Dealers that dealt with manual injection...maybe on a Mercedes? Or BMW? I'm pretty sure Edd had to rebuild/fix it though I can't quite remember how it worked. I'll probably remember in my sleep! LOL