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78 T/A Gauge Sizes

5.8K views 6 replies 3 participants last post by  Midnight Rider  
#1 ·
Can anybody give me the factory gauge sizes for a 78 Trans Am? The tach and speedo are the big ones, then there is the small one right between them. There are 4 smaller ones to the right (above where the radio would go) also. The smaller ones in my car are aftermarket and they don't look like they fit very well. I'm trying to buy new ones, but I don't know what sizes to get.
Thanks in advance!
 
Discussion starter · #3 ·
I don't have any good pics of my dash, but this is the same one.

http://www.pontiacserver.com/transam78/dash.jpg

I've never replaced gauges before, and really the only ones that I want to replace are the 4 smaller ones on the right side.
I'd like to replace the 3 in front of the steering wheel to make everything match, but those are original and I'd kind of like to keep them.
I would still like to know what size I would need to get in order for them to fit correctly.
It looks like those 2 1/8" seems to fit pretty well. I measured mine and they are about 2 3/4". Maybe that's why they don't look right?

Thanks again.
 
Discussion starter · #6 ·
The 2 1/16" are just the gauge body. With the bezels, they should be about 2 1/8" which will probably be just fine. Be careful when you order your gauges though, the one's you linked are Electric, not mechanical. Could present a major wiring headache.

Also, the 2 right most spots on the dash are for a/c and will be ducted behind the dash making it pretty difficult for a gauge installation.

I'd recommend staying with the factory tach and speedo and replacing your oil/water/volt with something close to your factory face.
Yeah, I'm definitely going mechanical... the last thing I want to do with that car is deal with more wiring issues. Actually, on my dash there are already gauges in those 2 spots on the far right, and I know they're easy to get at, so that won't be a problem.
Thanks for the help!