# My aftermarket boost gauge

**URL:** <https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756>\
**Category:** Maintenance/Repairs\
**Tags:** eclipse, mitsubishi\
**Created:** [November 20, 2009, 6:02pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756 "2009-11-20T18:02:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![sheapride96](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@sheapride96](https://community.cartalk.com/u/sheapride96)\
**Post date:** [November 20, 2009, 6:02pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756/1 "2009-11-20T18:02:11Z")

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i have a 1996 eclipse gst with a 16g turbo and i have a aftermarket boost gauge and the needle on the gauge is in the vac. side and it does not go in the psi side what does that mean

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [November 20, 2009, 6:03pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756/2 "2009-11-20T18:03:15Z")

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IF the gauge is correct, it means you have a dead turbo, giving no boost.

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**Author:** ![iceman138](https://avatars.discourse-cdn.com/v4/letter/i/71c47a/32.png) [@iceman138](https://community.cartalk.com/u/iceman138)\
**Post date:** [February 2, 2010, 4:39pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756/3 "2010-02-02T16:39:31Z")

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If it’s stuck in the VAC, then it’s probably a problem with the gauge itself, either it’s defective or it’s not hooked up right. Under normal acceleration, even in a non-turbo car, you should not be pulling vacuum.

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [February 2, 2010, 5:04pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756/4 "2010-02-02T17:04:32Z")

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Does it read 0 with then engine off, then go to the vac side with the engine on? Does it vary as you give it gas?

Here’s a good site with a demo: [http://www.secondchancegarage.com/public/186.cfm](http://www.secondchancegarage.com/public/186.cfm)

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [February 2, 2010, 5:06pm UTC](https://community.cartalk.com/t/my-aftermarket-boost-gauge/39756/5 "2010-02-02T17:06:19Z")

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The ONLY time you will see any boost is at WOT…At all other times, the throttle creates manifold vacuum… With a turbo, at WOT, the vacuum should drop to zero and then slowly build pressure as the turbo spins up…