Chris Biggs
Well-Known Member
The performance/vacuum gauge in my 66 Barracuda 273 is connected to the gauge but isn't connected in the engine compartment. Where do I tap it into to get the gauge working properly?
Performance Gauge
- Thread starter Chris Biggs
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Anywhere that you can get manifold vacuum. There are ports on the base of many carburetors. There also may be ports on your intake. You may need to buy some adapters to hook it up. Don’t use distributor vacuum hose.
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Greasyfingers
Well-Known Member
On the back of the intake, behind the carb, there should be a threaded hole for a fitting.
Chris Biggs
Well-Known Member
Chris Biggs
Well-Known Member
Greasyfingers
Well-Known Member
In the second second picture you can use the hole with the square head pipe plug as your port. Just need a fitting with the same threads and a small nipple for the vacuum hose.
Chris Biggs
Well-Known Member
Awesome! Thanks a million!
I dont think they are prone to leaking but I would check the gauge before using it along with all of the connections.
Chris Biggs
Well-Known Member
Is there a bench test for the performance gauge?
Sure. Suck on the hose. LOL or get a Might Vac. Handy dang tool right there. https://www.amazon.com/dp/B002YKGZBW/?tag=fabo03-20
33IMP
Well-Known Member
Yep, suck on the hose till you get a reading, then plug the hose with your tongue, and see if the reading drops.
motorpirate
serial mopar owner
volunteer
Well-Known Member
No question too small. (sigh)
Chris Biggs
Well-Known Member
It's not too small if you don't know, right?
if its the same as used on the 2nd generation cars, the vacuum hose is pretty small.
Redfish and I were posting about this in 2020. I think the hose fitting is 1/8".
If you can't find a NPT fitting with that size hose nipple, there are in-line hose to hose fittings that will let reduce the size.
The baseplate of the Holley carb ought to have a 3/16 manifold vacuum fitting on it. So that's an alternative but will need the reducer from the vauum hose that fits on it to the hose connecting to the vacuum gage.
Redfish and I were posting about this in 2020. I think the hose fitting is 1/8".
If you can't find a NPT fitting with that size hose nipple, there are in-line hose to hose fittings that will let reduce the size.
The baseplate of the Holley carb ought to have a 3/16 manifold vacuum fitting on it. So that's an alternative but will need the reducer from the vauum hose that fits on it to the hose connecting to the vacuum gage.
Chris Biggs
Well-Known Member
Thanks!
Here's the post ‘67 Barracuda vacuum gauge connection\
Scroll up in that theread for link from Al showing a repop of the intake manifold connection.
But 99% chance the Holley will have also have port on the base plate.
Scroll up in that theread for link from Al showing a repop of the intake manifold connection.
But 99% chance the Holley will have also have port on the base plate.
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