Boost Plug/Bushing Size?

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Hey guys, What is the size of the Boost port bushing on the Intake Manifold I need to install a boost gauge. I have a 1998. 5 24v.
Thanks.
Doug.

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1998. 5,2500,ISB,Auto,CC,4x4,White Sport,275hp Injectors,VA,BD Pressure Lock,16x8 Eagles,295 BFG's,2. 5" Skyjacker Lift,Stockland Seibring Shell.
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1973 R/S Z28 Camaro.
1989 Jeep Cherokee.
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DIESELRAM--It's a 3/4 fpt (female pipe thread). Get a brass 3/4 fpt X 1/2 fpt threaded bushing, then another bushing to get to the final size of your sensor. Got mine at Home Depot, Home Club or any good hardware store should carry them. A plumbing supply will also have them. Ron

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DieselRam, we usually install the boost signal line in the same port as you mention.
It's located between the fuel filter housing and the MAP sensor. It's 3/4 pipe. It's a bit tricky to find a 3/4 - 1/8 bushing. Otherwise use two bushings.

 

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To all who replied, Thanks again, Going to the Local Hardware store for Brass bushing after work... ... .
Doug.

 

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HVAC. . what you have failed to mention is that some have complained about eratic boost readings from the 3/4 port and that many have gone the root of drilling the intake, diesel ram... if ya insist on using the 3/4 and cant find one ... Mcmastercarr.com has um... . have a great day... . JB

 

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TST Products have them too. If fact you get one included w/ the boost gauge .

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99' Quad Cab, 4x4, Auto, 3. 55, All options except fog lights and leather, Glasstite topper, Chrome Nerf Bars, VA CPC, DiPricol EGT & Boost Gauges Pillar Mount, K&N Air Filter, Turbo Silencer Ring Removed, Infinity sound w/pillar tweeters, 300w speaker system under rear seat, Metalic Red (Boost Module and Elbow on order)

 

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With my 0-50 boost gauge on the way,I had already gotten a 3/4-1/8" brass bushing. But it seems that you guys have giving me a better place to put the sensor,in the Intake. So will I get a correct boost reading from there? I'm sorry if thats a stupid question. <font color=blue>

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'99 2500HD Quad Cab 4x4, Intense Blue Pearlcoat, Fully loaded w/Agate leather interior, 5-speed, 4. 10 Limited Slip, Skyjacker Leveling kit, Heckethorn Nitro 9000 shocks w/dual End to End steering stabilizers, 35x12. 50x16. 5 BFG/AT KO's on 9. 75x16. 5 Eagle 589 Aluminum Wheels, 9004 Cool Blue's, Silencer Ring removed, Fog Lights relay pulled, No muffler, No resonator, 4" straight pipe, Northwest Customs Stainless Steel Rocker Panels, Steel Horse Stainless Steel Nerf Bars, K&N Filter, POWEREDGE W/HOT#3 PROGRAM.

 

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Wowzy

You will get the same readings from either location, From doing a lot of serching on past post about the topic of where to locate your boost fitting, I mounted mine on the intake for a accurate reading... Alot of people complained of the bouncey-ness of the gauge when in the #/4 port of the ISB and switched to the intake... . As the saying goes... theres more then one way to skin a cat. JB