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MSD CD Problem
Mechanic installed a new MSD CD on my 77' 930. He also sent the tach to a shop to have it upgraded to the new system. The car runs fine, but the tach is now erratic. Sometimes the tach works, but sometimes not at all after the engine is started. When it does work, the idle indications are way too low and when engine is rev'd, the indications are jumpy, slow, stuck for a sec... He has checked the wires and the hookups at both side and believes they are correct.
Any thoughts on this problem?
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