 Tachometer Quits at 4,000 RPM, need help diagnosing problem |
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| jfort |
 Aug 3 2008, 12:35 PM
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#21
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Senior Member  Group: Members Posts: 1,137 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest 
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Well, just in case someone else runs into this, it turns out the black wire on the CD box that goes to the tach was bad, or at least partially bad? Why the tach would work up to 4,000 is beyond me. Anyway, we ran a new wire and that solved the problem. The tach gets its RPM info/feed from the CD box, not the coil. This low voltage source also worked for the shift light I installed. Sequential LEDs. Works great. Thanks to Tab Tanner for helping me figure it all out. He made a house call on a SUNDAY!
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