Recently jumped into an electrical project on my 1990 Rover Mini Sky. I am in the middle of converting the interior dash to a more custom/classic look. I searched the forums and web extensively and could not find an easy to follow post that helped much or fit my needs. I found some toggle switches I liked, but since they were Single Pole Single Throw (SPST) switches, I had to get creative in adapting these to the original rocker switch setup. I ended up splitting the light switch into two toggles (running and headlights). The rear defrost was a direct crossover, and I eliminated the brake fluid level indicator switch. I added a radiator fan switch, and lastly, I had a lot of stuff to figure out on the hazards... I ended up reading a post here on the forum (will not mention), and after recreating it, found that it only worked with the ignition on (not good). So I started from scratch and taught myself wiring concepts and came up with the below schematic. I then wired it up to test theory against practical application and presto...happy camper.
Disclaimer: I originally wired it using a third relay, but this allowed back-feed current to the ignition switch which, although functional, was not great. Have since eliminated the 3rd relay and installed two uni-directional diodes (SB560 Schottky) into the "hot" lines. Hope this write-up helps those looking to do similar conversions.