Tach and temp gauges inop? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

07SSSC · 05-21-2009, 10:03 PM

Any ideas? My truck has been running less then 2 weeks after sitting for almost 2 years. At first only the oil gauge worked, I assume the amp gauge works but it never really moves, and it seeems like it's charging ok. The fuel and speedo eventually started working after a few miles, just need to get the speedo accurate.

Anywho, the temp sender that was in it got smashed during install, not to the point that it came apart but it didn't work when I fired it up. Had NAPA get me a new one, I think they said it was out of mid 70s truck. Are there different resistance values for the senders or something?

The tach would barely wiggle when I revved it and just today rasied to about 400 rpm but doesn't move with actual rpm. It has a HEI in it and the tach worked the first go around. Now the other day i was tinkering under the hood and realzed that the 3-way connector from the dizzy to the cap was all sorts of toasted, the ground wire was even pushed out. I swiped a connector off another HEI I had and put it in, no more problems so far. Could that possibly be related to the tach issue?

Somehow I've got spider webs within the speedo and tach too, so I'll be pulling it apart anyways and can check it then. Sorry for the long post but I figured the more info I can give the better.

07SSSC · 05-22-2009, 09:35 AM

TTT, guess I better state that it's the stock gauges.

07SSSC · 05-22-2009, 03:49 PM

Over 40 views and not a single idea or possible answer? Apparently everyone elses always worked perfectly?...

Tman · 05-22-2009, 03:58 PM

I guess I would check the contacts between the printed circuit on the back of the gauge panel. After sitting for a few years there might be some corrosion or some kind of bad connection? Also make sure any grounds are clean. That is all I can think of now. The sending units should be the same. Hope this helps!

07SSSC · 05-22-2009, 11:31 PM

Quote:

Originally Posted by Tman

I guess I would check the contacts between the printed circuit on the back of the gauge panel. After sitting for a few years there might be some corrosion or some kind of bad connection? Also make sure any grounds are clean. That is all I can think of now. The sending units should be the same. Hope this helps!

Thanks. Figured I'd check it all when I have it out but wanted to know if I should look for anything specifically. Just wondering if maybe something else is having issues and/or not right.

05-21-2009, 10:03 PM	#1
07SSSC Registered User Join Date: Apr 2009 Location: Buhl, ID Posts: 288	Tach and temp gauges inop? Any ideas? My truck has been running less then 2 weeks after sitting for almost 2 years. At first only the oil gauge worked, I assume the amp gauge works but it never really moves, and it seeems like it's charging ok. The fuel and speedo eventually started working after a few miles, just need to get the speedo accurate. Anywho, the temp sender that was in it got smashed during install, not to the point that it came apart but it didn't work when I fired it up. Had NAPA get me a new one, I think they said it was out of mid 70s truck. Are there different resistance values for the senders or something? The tach would barely wiggle when I revved it and just today rasied to about 400 rpm but doesn't move with actual rpm. It has a HEI in it and the tach worked the first go around. Now the other day i was tinkering under the hood and realzed that the 3-way connector from the dizzy to the cap was all sorts of toasted, the ground wire was even pushed out. I swiped a connector off another HEI I had and put it in, no more problems so far. Could that possibly be related to the tach issue? Somehow I've got spider webs within the speedo and tach too, so I'll be pulling it apart anyways and can check it then. Sorry for the long post but I figured the more info I can give the better. __________________ '69 Chevy C/10-under reconstruction -- '68 C20 Camper 50th Anniversary-runs, but sorely needs a resto -- '07 Cobalt SS/SC-very fun DD -- '93 Chevy K2500-LQ4/4L80E swap -- '84 Trans Am-awaiting (LS) drivetrain -- '00 Trans Am-road tripper -- '06 Z06-577 WHP beast

05-22-2009, 09:35 AM	#2
07SSSC Registered User Join Date: Apr 2009 Location: Buhl, ID Posts: 288	Re: Tach and temp gauges inop? TTT, guess I better state that it's the stock gauges. __________________ '69 Chevy C/10-under reconstruction -- '68 C20 Camper 50th Anniversary-runs, but sorely needs a resto -- '07 Cobalt SS/SC-very fun DD -- '93 Chevy K2500-LQ4/4L80E swap -- '84 Trans Am-awaiting (LS) drivetrain -- '00 Trans Am-road tripper -- '06 Z06-577 WHP beast

05-22-2009, 03:49 PM	#3
07SSSC Registered User Join Date: Apr 2009 Location: Buhl, ID Posts: 288	Re: Tach and temp gauges inop? Over 40 views and not a single idea or possible answer? Apparently everyone elses always worked perfectly?... __________________ '69 Chevy C/10-under reconstruction -- '68 C20 Camper 50th Anniversary-runs, but sorely needs a resto -- '07 Cobalt SS/SC-very fun DD -- '93 Chevy K2500-LQ4/4L80E swap -- '84 Trans Am-awaiting (LS) drivetrain -- '00 Trans Am-road tripper -- '06 Z06-577 WHP beast

05-22-2009, 03:58 PM	#4
Tman Registered User Join Date: Mar 2006 Location: Reynolds, ND Posts: 78	Re: Tach and temp gauges inop? I guess I would check the contacts between the printed circuit on the back of the gauge panel. After sitting for a few years there might be some corrosion or some kind of bad connection? Also make sure any grounds are clean. That is all I can think of now. The sending units should be the same. Hope this helps!



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