Author Topic: Temp/Oil Gauge and Tach ?  (Read 19155 times)

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Offline ta78w72

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Re: Temp/Oil Gauge and Tach ?
« Reply #120 on: March 24, 2009, 09:05:11 AM »
I think your coil is OK.  Try replacing the module...keep the old one for a spare/troubling shooting part.  If that doesn't work, yeah, I'd try the coil again.  But you just replaced that, didn't you?  Did you keep the old one?

Offline mikeb78ta

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Re: Temp/Oil Gauge and Tach ?
« Reply #121 on: March 24, 2009, 09:11:14 AM »
Yeah I did replace the coil when I purhased the missing ground strap, But could it have gone bad due to a lack of the secondary ground?  Unfortunately I didn't keep the old coil, but since they are pretty cheap, I may go ahead and replace it and then keep this as you suggested.  If I do that along with  the module.  There isn't anything else we haven't tried...
1978 Trans Am 403 WS6, BLack, Camel Deluxe Interior

Offline brian c

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Re: Temp/Oil Gauge and Tach ?
« Reply #122 on: March 24, 2009, 10:50:33 AM »
One other really stupid question....the coil you're using now....is it white wire or yellow wire?

The original one from the factory was white wire for a pontiac 400. Just throwing that out there....

1978 Y88, '70 455 HO block bored 0.060, TH350, 3.42:1 gears...Oct '08 Fbodywarehouse Calendar - Woot!
1980 Firebird - no engine/tranny... to be pacecar clone

Offline mikeb78ta

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Re: Temp/Oil Gauge and Tach ?
« Reply #123 on: March 24, 2009, 11:31:04 AM »
One other really stupid question....the coil you're using now....is it white wire or yellow wire?

The original one from the factory was white wire for a pontiac 400. Just throwing that out there....
I believe that it is white.  I have the Olds 403 though.  I'll go back and check though.
1978 Trans Am 403 WS6, BLack, Camel Deluxe Interior

Offline brian c

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Re: Temp/Oil Gauge and Tach ?
« Reply #124 on: March 24, 2009, 12:00:52 PM »
Here's one other thought....

Try taking the tach physically out of the gauge pod and hooking it up as I mentioned above.

1978 Y88, '70 455 HO block bored 0.060, TH350, 3.42:1 gears...Oct '08 Fbodywarehouse Calendar - Woot!
1980 Firebird - no engine/tranny... to be pacecar clone

Offline mikeb78ta

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Re: Temp/Oil Gauge and Tach ?
« Reply #125 on: March 24, 2009, 12:11:25 PM »
Already Tried that as well.  No Luck, but thanks anyways... ;)
1978 Trans Am 403 WS6, BLack, Camel Deluxe Interior

Offline mikeb78ta

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Re: Temp/Oil Gauge and Tach ?
« Reply #126 on: March 25, 2009, 03:59:29 PM »
Well while I had the car apart today to replace the alternator field wire I figure I would go ahead and replace the module in the distributor and while I was at it run a new "COIL" wire from the distributor through the firewall and finish it at the tach hoping that would solve any doubts about the signal forn the coil at the distributor,  NO LUCK.  I have replaced everything now related to the Tach.  Nothing has worked. I'm completely stumped.  Oh yeah I tried the other 2 Tachs I have Also, Neither of them worked either. ??? ??? ??? ??? ???
1978 Trans Am 403 WS6, BLack, Camel Deluxe Interior

Offline ta78w72

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Re: Temp/Oil Gauge and Tach ?
« Reply #127 on: March 25, 2009, 04:53:05 PM »
It has to be the signal from the coil...has to be.  If your test light didn't dim the signal isn't reaching the tach.  Look for an old guy at work...one that's at least as old as Rick and myself.  Ask them if they have a dwell meter.  They have the tach built into them.  There has to be at least one person that has one.

Offline mikeb78ta

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Re: Temp/Oil Gauge and Tach ?
« Reply #128 on: March 25, 2009, 05:13:51 PM »
I will find out about the dwell meter.  I am considering taking my car out of commission for a month or so anyways.  Long overdue for a much need paintjob and engine rebuild.  I will get to the bottom of this eventually.  Thankfully I will be intown for the next couple of months without any travel for work.  That will give me more time to go through things slowly and find more little Gremlins...  Thanks again for all the advice.  It has definitely paid off...
1978 Trans Am 403 WS6, BLack, Camel Deluxe Interior

Offline BigJer

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Re: Temp/Oil Gauge and Tach ?
« Reply #129 on: June 21, 2011, 12:42:38 PM »
Did you ever figure this out? I'm having the same problem with my 81(converted to 73)
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Offline Cbled56

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Re: Temp/Oil Gauge and Tach ?
« Reply #130 on: July 09, 2011, 02:39:28 AM »
I don't think it was ever resolved on this site, as I have the same problem too.  I have looked at most of the different threads on this subject, but still can't get mine working.  I might have to just spring for the cash and get a new tach.  I'm starting to think it is a 403 problem.  Most of the ones I have seen are late 78 on that folks have trouble with.  Don't think many tach's on the Pontiac motors had problems.  Let me know if you get yours working, and I will post what I did to get mine working, if I ever do.
Thanks. 
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1976 Formula 350
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1978 Trans am
1979 Trans am
1968 Olds 442
1971 TR6

Offline ta78w72

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Re: Temp/Oil Gauge and Tach ?
« Reply #131 on: July 09, 2011, 11:24:35 AM »
There is no distinction between a "pontiac" tach and a "403" tach.  Those clusters are interchangeable.

Offline Cbled56

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Re: Temp/Oil Gauge and Tach ?
« Reply #132 on: June 09, 2012, 01:58:54 PM »
Well it has almost a year since this thread has been replied to.  I still have not got my Tach working correctly, just checking to see if the others did?  I'm beginning to think mine might be in the distributor.  Please let me know if you were able to solve the problems encountered, and how you were able to solve them.  I will continue to do the same.
Thanks.
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1966 GTO Vert
1969 GTO
2006 GTO
1972 Formula 455HO
1976 LE Trans am
1976 Formula 350
1977 Grand Prix
1978 Trans am
1979 Trans am
1968 Olds 442
1971 TR6