I do not have a book per say. but I do have the downloaded wiring diagrams for the 91 Chev Astro 4.3l auto. I do not know if the oil press switch is looking for the same pressure as what my l6 original pump puts out.
Also the prom is Delco AUMJ 1278 underneath it has
JT8(G)/J6/P
LFIVN960
AE03