Boost gauge line, rubber or nylon?

[usmc0651dns]

I have an older autometer 30 / 20 mechanical boost gauge. Does it matter whether I use rubber vacuum hose or nylon line? If I do need to use the nylon, is there any special consideration when T'ing it into the rubber vacuum line running from the FPR to the FPS?

 

[8BoltDSM]

personally i use the nylon line because i feel it gives more accurate readings.

 

[LiquidX]

If you have a barb fitting on the back of the gauge then use the rubber vacuum line. The nylon line needs a compression fitting at the gauge fitting and when teeing into your source line it's good to use epoxy or JB Weld to make sure the line stays in the special t fitting. Be careful if you use the nylon as it can become pinched from a crease and give inaccurate readings.

 

[GRAVEDIGGER]

I use rubber and have never had any problems with it. I find it easier to work with too.

 

[gofer]

Just to add a bit. The nylon line, whether its creased or not, will get old and brittle with age and heat cycles. After awhile you'll start getting boost leaks all over the place just in the line going to your boost gauge, the better choice here is definitely the rubber line.

 

[8BoltDSM]

the rubber line should give you no problem and as the others stated its eaisier to work with and route to your gauge. I have slight ocd and worry about certain things. thats why i have a braided stainless line running to my mech oil press. gauge

 

[97gst_spyder]

I used regular rubber hose. Worked fine, seemed a little slow to react after awhile. Then I found some steel braided vaccum hose out of a bmw 745, now my boost gauge seems to have a much crisper responce.

 

[usmc0651dns]

Awesome, I will stick to the rubber. Thanks!

 

[nlzn]

I have rubber going to nylon and then the gauge.
the nylon line was almost a perfect fit sliding into the rubber hose.

Requires to careful use of just a little 5minute epoxy to make a perfect seal.

 

[ramsack]

The nylon does suck as far as damage from heat, but they do make the same size (1/8") line in polyurethane... Rubber gets old and brittle too. The thinner, harder line will technically be more accurate and responsive. How much you notice depends if you have robot eyes or not.

 

[Boomdeeze]

Does anyone know where to buy the barb fitting for the back of the gauges? I found it a couple weeks ago but I can't find it anymore.

 

[ramsack]

A hardware store should have a fitting like that (1/8" NPT).

 

[Boomdeeze]

Ok thanks, I think im gonna switch to the rubber hose. That nylon hose just kinks way too easily.

 

[LiquidX]

You may not find it right away. I needed to go to a smaller local store to get the fitting. Neither Lowes or Home Depot carried it.

 

[gofer]

Auto Zone carries those fittings in the back, just tell them you're looking for brass NPT fittings and they'll more than likely invite you back there or ask what size.