Question about taping for boost gauge.
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From: Amarillo, TX
Question about taping for boost gauge.
I have an Autometer boost gauge 4305. And I know I need to install in into the pipe going into the intake.
My question is, what size hole do I need to drill? and what size tap is needed? Is it a NPT tap? I am clueless on this I have never taped anything before. I do have a set of metric and SAE tap and die sets but I don't think they will work.
Thanks in advance for the help.
My question is, what size hole do I need to drill? and what size tap is needed? Is it a NPT tap? I am clueless on this I have never taped anything before. I do have a set of metric and SAE tap and die sets but I don't think they will work.
Thanks in advance for the help.
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From: Amarillo, TX
So do I need an 1/8" drill bit and 1/8 NPT tap?
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
You need an 1/8 NPT tap but the drill size is difference. The drill size should be listed on the tap. DO NOT GO BIGGER on the drill size or you won't have enough threads to hold the fitting in the elbow, which is only pot metal and fairly soft. Give me a few minutes and I'll go look in my set to find the correct size for you.
Wouldn't you know it??? All my taps list a drill size EXCEPT the 1/8 pipe, which is NOT 1/8"
Wouldn't you know it??? All my taps list a drill size EXCEPT the 1/8 pipe, which is NOT 1/8"
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Posting Guru
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From: Amarillo, TX
You need an 1/8" NPT tap but the drill size is difference. The drill size should be listed on the tap. DO NOT GO BIGGER on the drill size or you won't have enough threads to hold the fitting in the elbow, which is only pot metal and fairly soft. Give me a few minutes and I'll go look in my set to find the correct size for you.
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
Either should have it, but Lowe's is the better choice to have everything you need drill bit wise.
Tuned
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From: Castalian Springs tn
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From: Amarillo, TX
Thanks. I read its and R type or .339 or 21/64. Is that the same as what you are saying?
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Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
I would go with the 5/16 as it will give you a red hair's more meat when you tap. Remember that the NPT thread is TAPERED and you don't have to go all the way in on the tap to get a big enough hole to thread your fitting into. Leave yourself a little safety but also remember that you're going to be using some kind of thread sealer (liquid better here) that will take up a tad of space.
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
27 would be threads per inch. match the tap to the fitting you are going to be screwing in. the threads from one should exactly match the threads from the other.
Fleet Mechanic
Joined: Jun 2006
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If you have an '04 you probably have the dummy butterfly thingy between inlet elbow and the manifold. It is the thingy that has two electrical connectors attached that do nothing. Instead of drilling the elbow you might want to consider drilling the dummy butterfly thingy. If I remember right, it is square, not round like the inlet. Just food for thought.
DSMMH
DSMMH
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From: Amarillo, TX
If you have an '04 you probably have the dummy butterfly thingy between inlet elbow and the manifold. It is the thingy that has two electrical connectors attached that do nothing. Instead of drilling the elbow you might want to consider drilling the dummy butterfly thingy. If I remember right, it is square, not round like the inlet. Just food for thought.
DSMMH
DSMMH
BTW Went at lunch and got what I needed at Lowes.