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I found a copy of the wiring diagram you are looking at, same but different to my 1987, I'm thinking they had an engineering student redraw it to keep him busy, change name of charging pressure control switch to charge air pressure indicator switch, etc. I'm not sure the 2nd white wire going to connector T65 actually exists, the way it is shown it would bypass the speed relay.
What they now call "relay air meter charge air pressure delayed" should be the yellow relay.
I think it is worth the time to get the OB switch back to working, can save you from a $30k rebuild
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87 930,
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