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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,410
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Not an uncommon problem in our aging cars. A couple of things cause that. One is the glass moving as it heats up. The tach needl will actually touch it and freeze. Another is diodes that get hot in the sun and quit until they cool off.
Typically the tach will begin working again once you get air moving throught the vents.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-21-2008, 01:07 PM
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