Boost pressure switch 25503871
- Thread starter tito
- Start date
Anthony P
sharing knowledge with those who care to listen
- Joined
- Jan 24, 2007
don't see them come up for sale often. Rich Belardi had a couple NOS units for sale in May and June 2023. Sold for $350 each.
suggest you widen your search to include the various f*book groups if you want an OE GM part. and be prepared to pay dearly.
otherwise, model something from the OE part with a readily available hobbs switch from the likes of the link below that give you configuration options. the unit in the link below is $25 and for a few bucks more, change configuration from 1/8 NPT to barb fitting. and it's adjustable.
Or just adapt a generic hobbs switch with some fittings and wiring adapters found via a basic internet search for hobbs switch.
suggest you widen your search to include the various f*book groups if you want an OE GM part. and be prepared to pay dearly.
otherwise, model something from the OE part with a readily available hobbs switch from the likes of the link below that give you configuration options. the unit in the link below is $25 and for a few bucks more, change configuration from 1/8 NPT to barb fitting. and it's adjustable.
Or just adapt a generic hobbs switch with some fittings and wiring adapters found via a basic internet search for hobbs switch.
Attachments
Lockman
OH, OK .......Now I get it
- Joined
- Dec 6, 2018
......2.5 & 10 , on our Hot-airs . I copied this from Vortex awhile Back :
"There are actually two lights that come on under boost.
They work as follows;
light When the boost rises above 2.5 inches of mercury the first setpoint in the round hobbs type switch is reached, it shorts the wht/blk stripe wire to ground to light the first light, when 10 inches is reached the second switch inside shorts the light blue/yellow stripe wire to ground lighting the second."
As far as ' Cut out ', I have'nt a clue ?
"There are actually two lights that come on under boost.
They work as follows;
light When the boost rises above 2.5 inches of mercury the first setpoint in the round hobbs type switch is reached, it shorts the wht/blk stripe wire to ground to light the first light, when 10 inches is reached the second switch inside shorts the light blue/yellow stripe wire to ground lighting the second."
As far as ' Cut out ', I have'nt a clue ?
- Joined
- May 25, 2001
Okay, guess the switchs making (shorting) to ground is what I have missed.
I think referencing inches of mercury is confusing for some, should be a PSI figure for boost. Something above zero.
I have a few of these switches, I need to see what these settings are.
I think referencing inches of mercury is confusing for some, should be a PSI figure for boost. Something above zero.
I have a few of these switches, I need to see what these settings are.
Lockman
OH, OK .......Now I get it
- Joined
- Dec 6, 2018
Yes it is confusing , but that's what Vortex wrote? Found this also . I trust what John Spina say's 
:
" This design merely indicates low boost (in yellow) and
high boost (in orange). The low boost is preset to illuminate the yellow lamp at 2.5PSI. The
high boost is preset at 10PSI."
:" This design merely indicates low boost (in yellow) and
high boost (in orange). The low boost is preset to illuminate the yellow lamp at 2.5PSI. The
high boost is preset at 10PSI."
used
Anthony P
sharing knowledge with those who care to listen
- Joined
- Jan 24, 2007
Gents,
great info here to confirm how the OE switch is setup for both dash lights and to offer ones from both your parts stashes. a bit easier to use an OE unit than fab a mounting bracket for switches and wiring mods.
great info here to confirm how the OE switch is setup for both dash lights and to offer ones from both your parts stashes. a bit easier to use an OE unit than fab a mounting bracket for switches and wiring mods.
- Joined
- Sep 21, 2018
I have 2 used ones...no way to test them ...as I do not have a digital dash....I will sell them for 50 bucks a piece ....and if they do not work, just send them back to me for refund ...you will just have to chance it ...and eat on shipping back ....so I know you are not a liar
