Starting isssues and spark knock Q's

[walshy2103]

Hi, can anybody help me please? ive recently blown up the engine (7MGTE) in my supra and replaced it with an other. Everything is fine apart from i have not got a spark. I broke the reverse speed sensor off the gearbox (have not got a clue what the reverse speed sensor does??) does it have anything to do with the spark? the ignitors should be grand because they were not touched. Could somebody point me in the right direction?? thanks