I have been wondering how my local gets it's Vindaloos bright red
I've never had a red vindaloo, mine have always been some shade of brown. Must be regional variation again.
Anyway if you want bright red I would suggest:
1. lots of tomato and/or tomato paste
2. lots of kashmiri chilli powder
3. (and most likely) lots of red food colouring
A tomatoey vindaloo is, by the way, a complete anathema to me.