This kind of an old thread but my 89/90 has a brake light that comes on when you start cranking the engine. It goes off when it starts. My GM instrument cluster has a 4" speedometer on the left a 2" "brake light indicator in the middle and another 4" dial on the right which has the gas gauge,oil pressure gauge, temp gauge and voltage gauge. Hope this helps. This was all standard GM back then. My 1976 van was pretty similar to this setup.
1990 28' Georgie Boy, 454, 4bbl, Thorley Headers, Recurved Distributor, 8.75 mpg. RVM 76