Late Combo Gauge w/ temp ('74) wiring to a '72 Options

[Literati914]

I'm hooking up a late combo gauge from a '74, the one with a temp gauge at the top (914.641.101.50) - into my '72.

I'm a little confused with the brake warning light circuit .. the diagram below shows two BR/YL wires for the M/C (apparently) & E-brake handle switch. The '72 harness has these wires as BR/WH .. so that's obvious. But the '72 also has a third BR/WH wire going to this light from the safety belt switch. So three BR/WH wires to this light socket via a "dual spade connector". Adding these three BR/WH wires at the warning light is again, obvious. But this diagram has no mention of the BK/WH/GR wire that comes from the hazard flasher. Maybe it was accidently left off - or possibly on purpose because the '74 didn't do it that way ? (IMG:style_emoticons/default/confused24.gif) If it's recommended to add it (via a second dual spade connector), which side of the light fixture would it connect to - RD/WH or BR/WH ?

[Literati914]

Electrical Diodes ?

The stock '72 fuel combo gauge incorporated two diodes .. one between the brake warning light and the 'seatbelt & hand brake wiring'.

Then there is also a diode between the generator light and the brake warning light. This is the one I'm questioning.. what's it for? Was it because the stock combo gauge actually had two brake warning lights - and therefore not needed on the later combo gauge that I'm using (w/ temp gauge incorporated)?

Basically, I'd be ok with leaving it out if not needed, but want to be sure it's not a needed item with this late combo gauge. Anyone know?