Manifold Vacuum - where is it?

[gimmea250swb]

I'm sorry for the novice question but I've never tuned a carb before.  Where do I hook up the vacuum pressure meter?  I've got a 3259-1 carb.  I see new carbs have a nipple you can access directly on the carb but it doesn't look like the 3259 has one.  Do I hook it up to the actual manifold?  My guess is I pull the 1" hose coming off the front driver's side on the manifold.  Is this correct or is there an easier place?

[Coralsnake]

Only if you want engine coolant to spray out. Thats a heater hose.

You might have an accessible port somewhere else on the manifold

[gimmea250swb]

Ha!  I should've looked.  The hose goes through the firewall.  How about is one to the rear?

[zray]

you should have several options, for example , the pcv hose should be hooked up to manifold vacuum.

Z.

[J_Speegle]

Yes you could use that unused rear port after removing the plug and installing a correct nipple fitting for the rubber tubing to the gauge then replacing plug after your done adjusting things