new gauge cluster now wont start

here is a good read: http://www.autometer.com/tech_faq_answer.aspx?sid=1&qid=5

You may have fried the voltmeter? Not sure, but the ammeter wire comes form the alternator and feeds the main circuit from the other side of the ammeter.

You can by pass the ammeter at the dash by bolting the two ends together and taping them up...somewhat temporary fix, but it will get power distributed.