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#1 |
Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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Tell me how to build a tach/vac
I know of 4 different dash possibilities. There may be more.
Gauge, gauge with tach, gauge with vac and gauge with tach and vac. I have a tach dash and would like to add a vac gauge. I know that the tach dash does not have the hole punched for the vac gauge. This is difficult I hear. Is it easier to use a vac dash and add the tach or how would you do it?
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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#2 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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If you buy the vacuum guage kit from one of the board venders it comes with all of the needed parts.
John
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#3 |
Senior Member
![]() Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
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You either need to get the inner bezel with the correct holes or graft another hole from a doner where it can't be seen when it's all assembled. To be correct you'd need a lens with vacuum on it as well or if you like just polish it clear. I personally grafted the Vacuum part of the lens into my tach lens. It was BIG job but it was 10 years ago when repro stuff was not available and I had Zero money to spend
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Saskatoon, Saskatchewan Canada |
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#4 |
Registered User
Join Date: Jul 2001
Location: North Louisiana
Posts: 4,501
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I built mine using a tach dash. I replaced the lens with a new vac/tach lens, drilled a hole in the backing plate to mount the vacuum gauge, and grafted a doner piece to my inner bezel(the metal tin with openings for each gauge). I cut a hole (about 1 & 3/4 I think) in the tin where the vac. gauge should be, then cut a larger piece from a donor tin that had the opening stamped in it, and epoxied it in place. The doner tin was a regular gauge dash, so I used the temp gauge opening as my donor. I know this probably doesn't make much sense, but anyway, it can be done, and wasn't too hard to do. I can't tell that mine was ever modified. I thought about making a tach/vac dash out of a vac dash that I had, but the opening in the tin for the tach is an odd size, and doesn't match the other tin openings, so I had no donor tin. You can always just cut a regular hole in the tin, but it won't look right at night when your dash lights are on.
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