75 dash in a 78 - Chevy Nova Forum
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Old 7th-November-2009, 12:39 AM   #1
jhaber01

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75 dash in a 78

Will a 75 dash pad and cluster fit in a 78. I know the bodies are the same but the dash is different. I have a 78 and really like the 75 setup better.
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Old 7th-November-2009, 09:46 AM   #2
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The instrument cluster bezel and pad will onto the metal frame, but if you have factory AC the vents and ducting under the dash are very different.
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Old 7th-November-2009, 09:52 AM   #3
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BTW the 77 and newer dashes are easier to modify with after market gauges. I added an Autometer tachometer in the clock hole. If a new plate were made the whole area could be filled with Gauges.


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Old 7th-November-2009, 05:30 PM   #4
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Hey Philip, very nicely done tach. Do you have a photo of the back of the cluster to see how it was "modified". I'd also like to see how you modified the tach itself.
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Old 7th-November-2009, 09:51 PM   #5
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Jay the back isn't very pretty and there was nothing modified on the tach.

I pretty much just hacked a big hole in the area the clock would be, but just big enough for the housing to fit snug and be centered in the opening.



Then I slid the tach in with the ring clamp mount attached. The clamp was adjusted to seat against the inside of the cluster housing so when the cluster is assembled the tach is held in place.





The printed circuit needs to be left intact for the dash lights to work, so I insulated it with tape where it lays on the tach housing. I would have prefered to trim it off but that one run for the dash lights prevented it.

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Old 7th-November-2009, 09:59 PM   #6
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BTW the in progress photos do not show the speedometer I am using. I did find one from a manual transmission car that does not have the gear indicator on it.
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Old 8th-November-2009, 09:13 AM   #7
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Thanks for the info. Looks like you have the tach in there pretty snug. That printed circuit board could be difficult sometimes. I'm not an electric guru to even attempt to work around it, so it's one of those things we have to live with.
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Old 8th-November-2009, 10:36 AM   #8
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I wanted to cut the end of the circuit off. I tried to solder a jumper lead to reroute the circuit but the printed copper is just to thin. It transfers heat rapidly melting the circuit board. I found my beryllium/copper soldering tweezers after digging around in my tool box. The material absorbs heat rapidly and when clamped onto the copper it will stop the flow of heat past the point they are attached. So I am going to try again to eliminate the extra piece hanging out.

The only thing that holds the circuit to the cluster are the bulbs and the contacts for the fuel gauge. It is easy to remove and replace.
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Old 8th-November-2009, 02:19 PM   #9
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Phillip,
What kind of warning lights were in the area where you put your tach and did you do anything about the warning lights?
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Old 8th-November-2009, 10:55 PM   #10
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The only warning light was the temp. The oil, brake, gen and seat belts lights are all in the other module.

I did not need the temp light, the gauge is fine, I look at them every few seconds.
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Old 9th-November-2009, 08:54 AM   #11
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Quote:
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The only warning light was the temp. The oil, brake, gen and seat belts lights are all in the other module.

I did not need the temp light, the gauge is fine, I look at them every few seconds.
Thanks. I knew there was at least one warning light in that cluster, but couldn't remember which one it was.
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Old 9th-November-2009, 06:47 PM   #12
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Hey Philip, what model number and diameter is that Autometer tach? Also do you know if it comes in white face? Here are pics of what I did to my instrument panel using white face gauges (water-slide decals).





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Old 9th-November-2009, 10:04 PM   #13
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It is an older Pro Comp Memory Tach, and it appears there is one in white.

http://www.summitracing.com/parts/ATM-6604/
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Old 10th-November-2009, 05:04 PM   #14
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Quote:
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It is an older Pro Comp Memory Tach, and it appears there is one in white.

http://www.summitracing.com/parts/ATM-6604/
That should work, thanks!
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