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Mod | | | Forums66 Topics128,106 Posts1,056,214 Members48,436 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2013 Posts: 93 Shop Shark | | Shop Shark Joined: Sep 2013 Posts: 93 | Purchased the two gauge pac from NVU of Detroit. The make an adapter plate that mounts to the existing dash studs for the standard gauges. The adapter that was sent will not work on a 1947 GMC truck! My truck is bone stock in dash area. My studs are a square dimention the adapter are not, so no fit! NVU says they have made thousands and never a problem.... Till now. They are willing to plasma cut me a new adapter plate. Very willing to get this sorted out. Just weird.
Question is; anybody familiar with two different gauge mounting stud patterns? Has anyone else encountered this?
1947 GMC Truck 5 window, Long Bed
2008 Corvette Roadster
2008 Harley Davidson FXDL
2011 F150 Ecoboost 4X4
2015 Subaru Outback AWD
"only the strong survive"
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Measured a set that I had on the shelf, 90 mph so they must be out of a '52 or '53 wider tabs at the bottom. Found this at JC's site: http://www.oldchevytrucks.com/blog/...l-articles/1947-55/speedometers-1947-55/1947 was square around 4 3/4". 1948 up went to just under 6" at the bottom. Denny Graham Sandwich, IL
Denny G
Sandwich, IL
| | | | | Joined: Sep 2013 Posts: 93 Shop Shark | | Shop Shark Joined: Sep 2013 Posts: 93 | Thank you Denny Graham. Read the article, now I am educated in AD gauges!!
I forwarded the information to NVU gauges in Detroit. The are lazer cutting me the correct adapter plate for their gauge set, no charge.
1947 GMC Truck 5 window, Long Bed
2008 Corvette Roadster
2008 Harley Davidson FXDL
2011 F150 Ecoboost 4X4
2015 Subaru Outback AWD
"only the strong survive"
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Glad to have been a help Bruce---for once! That was news to me
also, never knew the first of the breed were like that.
As we discussed the other day, why would they have changed the
design/tooling for the gauges after the first year???
Again, I think it was to guarantee that when they were slapped
in on the third shift production line for the next half dozen
years, there could be no mistake in the way it was clocked.
I'll bet a few of those first year GM cabs came off the
production line with the speedo or gauge set looking a
little cockeyed.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
| | | | | Joined: Sep 2013 Posts: 93 Shop Shark | | Shop Shark Joined: Sep 2013 Posts: 93 | All had to do with the transmission. All 47's were floor shift, both 3&4 speeds. When the shifter shaft had to sit above the column they had to create a pocket in the lower dash for it to go through. Well, the gauge mounting was in the way. Hence, the splayed mounting lower bolt points. All makes sense now Denny.
1947 GMC Truck 5 window, Long Bed
2008 Corvette Roadster
2008 Harley Davidson FXDL
2011 F150 Ecoboost 4X4
2015 Subaru Outback AWD
"only the strong survive"
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Guess I din't read down far enough. Well that makes more sense
than my guess. But why relocate both, only the lower left
bracket would have been in the way of the shifter column.
But that's enough to get people thinkin'.
DG
Denny G
Sandwich, IL
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