Installed tach now temp gauge is off - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Red68 · 05-22-2011, 09:39 PM

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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cppursell · 05-23-2011, 02:22 AM

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

JimKshortstep4x4 · 05-23-2011, 07:23 AM

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

Ryan Hubbard · 05-24-2011, 10:16 PM

Also if you have a bad ground for your dash panel, it can cause the temp gauge to read high.

05-22-2011, 09:39 PM	#1
Red68 Registered User Join Date: Jan 2002 Location: Rhome, TX Posts: 209	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? Posted via Mobile Device __________________ 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

05-23-2011, 02:22 AM	#2
cppursell Registered User Join Date: Dec 2008 Location: San Francisco, CA Posts: 144	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

05-23-2011, 07:23 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	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 __________________ 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

05-24-2011, 10:16 PM	#4
Ryan Hubbard Registered User Join Date: Aug 2007 Location: Mission Viejo, CA Posts: 288	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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