archemitis Posted December 18, 2004 Share Posted December 18, 2004 6 cylinder in my 86 hatch, the tach works, but i wonder if its reading correctly.... its the original one from the 4 cylinder. Link to comment Share on other sites More sharing options...
Qman Posted December 18, 2004 Share Posted December 18, 2004 Probably not. 2 too many cylinders. Hook up an aftermarket one to verify. They adjust for the 4, 6, and 8 cylinder motors. Or hook i tup to a diagnostic scope and check the rpm's that way. Link to comment Share on other sites More sharing options...
archemitis Posted December 18, 2004 Author Share Posted December 18, 2004 ya, im assuming im reading 50%higher than the revs im realy running. do aftermarket tachs have settings for dual or single fire ignitions... ours is dual fire, but im just wonderin... Link to comment Share on other sites More sharing options...
Qman Posted December 18, 2004 Share Posted December 18, 2004 I don't know, I would assume so as we aren't the only ones with that type of system. Call around and check with different parts outlets. Link to comment Share on other sites More sharing options...
subiemech85 Posted December 19, 2004 Share Posted December 19, 2004 1. go by what real idle speed is, and what "indicated" idle speed is 2. use a non contact optical tach 3. use a contact mechanical tach :cool: Link to comment Share on other sites More sharing options...
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