Even a few new earth straps wouldnt hurt battery to motor motor to chassis battery to body.
I think Tojo earth different sections of the 4X4 like bullbar ,engine bay, cab general body and then cargo area.
Maybe someone up your way can drop in and nut it out over a few beers, make sure all vacuum lines are new and not
perished, easy and cheap to replace IMO. Youll get it soon enough