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05-22-2011, 09:39 PM
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#1 |
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Registered User
Join Date: Jan 2002
Location: Rhome, TX
Posts: 209
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Installed tach now temp gauge is off
Drove my truck around yesterday and it ran great. Took my dash out last night to install my new factory tach and when I took it out today the temp gauge is reading hot!!! Can't imagine anything happen to the engine over night. Thinking it is something with the temp gauge. Any thoughts on whatnthe problem might be?
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1968 C10 LWB 327 bored 40 over, RHS heads, KB pistons, Eagle rods, Edlebrock carb & intake 1968 C10 flatbed 307 w/ 4 spd manual (dads old ride) 1936 1/2 tn pickup, 400sb 350 turbo (partially restored) 1949 1/2 tn, needs complete restore (future project) 1969 Chevy impala 4 dr no post (wifes future car) 2010 GMC Serria 4x4 crew, leveling kit |
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05-23-2011, 02:22 AM
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#2 |
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Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Installed tach now temp gauge is off
I replaced my idiot lights with instruments and the temp gauge always gave me trouble until I bypassed the original wiring harness and routed a wire right from the sensor to #6 connector.
http://www.gmcpauls.com/Tech%20Tips1.htm |
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05-23-2011, 07:23 AM
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#3 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Installed tach now temp gauge is off
If the green wire to the temperature sensor is disconnected then the dash unit will read hot. To test the circuit ground the green wire with the key on. If the gauge reads cold then the wire is good.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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05-24-2011, 10:16 PM
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#4 |
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Registered User
Join Date: Aug 2007
Location: Mission Viejo, CA
Posts: 288
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Re: Installed tach now temp gauge is off
Also if you have a bad ground for your dash panel, it can cause the temp gauge to read high.
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