Hi
I am a proud owner of Landcruiser GR71. I am also close to this upgrade, and here is my progress:
After page B-15 from the manual. as I am after the wiring to the oil pressure sender. My car comes with light only (single wire oil signal sender), and I am replacing the cluster with one with tacho and oil pressure gauge. Everything working except the oil pressure gauge. I got the 3 wire oil pressure sender ready, I just need the wiring diagram