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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,059 Posts1,055,825 Members48,426 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#86319 04/15/2004 2:30 AM | Joined: May 2003 Posts: 53 Member | | Member Joined: May 2003 Posts: 53 | My 1955 GMC 500 has the factory tach and transmitter on the firewall I need a wiring diagram for this unit. Any help will be appreciated Thanks Biddaboy :confused: :confused: :confused:
1956 GMC TF 1/2 ton
1955 GMC 500 model (Gumby)
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