1983 733i no spark condition have fuel pre...

1983 733i no spark condition have fuel pressure and pulse no voltage out-put from reference sensor both speed sensor and ref sensor were rpl with used sensors could it be another faulty pair?? just got ohms specs will be measuring all sensors any other areas of concern that might create this no spark condition... are the sensors easiest accesses from under car or over the fender?? i just inherited this brain burner any help would be apprecaited