Have repaired these instrument pods, as others also have done, what exact information are you seeking?
Keep in mind these types of electronics are from a past era, while certain parts or aspects can be addressed, specific intergrated circuits are obsolete. Even now, have a 1992 Mazda 929 dash instrument(s) for repair, speedo odometer are in house ND ic's, restricted space available for modification, use second generation air core drive ( speedo ) ic's and stepper motor drive ( odometer ). A technical challenge of much demand. Strip all passive componetes from the original pcb, then populate the old holes and tracks with redesign components available.
Technique used to repurpose the Tacho pcb of original RGS form, with substituted LM2917 tacho ic, ( also has been used to process variable reluctor pickups, iis ). Speedo is an eddy current device, apart from the meter movement, basic mechanical conversion front wheel to dial face. Wedge indicator lights can be catred for with modern leds, cracked plastic i use metal filled automotiove epoxy ( sort of Devcon ), with bridging copper wire embedded. Labour of love to say the least. Not economical as a business notion this type of rectification. Special skill new and old. techniques. HTH j