# How to Scope outputs - AUX 4

**URL:** <https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471>\
**Category:** GENERAL\
**Created:** [April 4, 2025, 12:42am UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471 "2025-04-04T00:42:42Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![T1BRAY](https://avatars.discourse-cdn.com/v4/letter/t/b2d939/32.png) [@T1BRAY](https://community.ecumaster.com/u/T1BRAY)\
**Post date:** [April 4, 2025, 12:42am UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/1 "2025-04-04T00:42:42Z")

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Hello All new to ECU Master Black . Question can you scope AUX outputs ? More specifically the Aux 4 Tach output .? Tach not working on Build . Thanks in advance.

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**Author:** ![T1BRAY](https://avatars.discourse-cdn.com/v4/letter/t/b2d939/32.png) [@T1BRAY](https://community.ecumaster.com/u/T1BRAY)\
**Post date:** [April 4, 2025, 2:31pm UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/2 "2025-04-04T14:31:06Z")

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Anyone here have an answer ?

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**Author:** ![ProperTuningOG](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/propertuningog/32/3481_2.png) [@ProperTuningOG](https://community.ecumaster.com/u/ProperTuningOG)\
**Post date:** [April 4, 2025, 6:04pm UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/3 "2025-04-04T18:04:27Z")

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Is your tach negative based or 12v based? You may need a pullup to make it work. Aux outs are all negative based.

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<div class="post-metadata">

**Author:** ![T1BRAY](https://avatars.discourse-cdn.com/v4/letter/t/b2d939/32.png) [@T1BRAY](https://community.ecumaster.com/u/T1BRAY)\
**Post date:** [April 5, 2025, 7:43pm UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/4 "2025-04-05T19:43:24Z")

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Can it be scoped to determine the signal that is generated ? Thank you

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<div class="post-metadata">

**Author:** ![derUltraTT](https://avatars.discourse-cdn.com/v4/letter/d/ba8739/32.png) [@derUltraTT](https://community.ecumaster.com/u/derUltraTT)\
**Post date:** [April 9, 2025, 8:42pm UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/5 "2025-04-09T20:42:37Z")

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Aux4 is an output. So u cant measure anything connected there…so nothing to be scoped.

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**Author:** ![mkuklis\_ECUMASTER](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mkuklis_ecumaster/32/104_2.png) [@mkuklis\_ECUMASTER](https://community.ecumaster.com/u/mkuklis_ECUMASTER)\
**Post date:** [April 10, 2025, 10:16am UTC](https://community.ecumaster.com/t/how-to-scope-outputs-aux-4/3471/6 "2025-04-10T10:16:56Z")

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No, there is no scope feature for outputs.

If you want to confirm the generated signal, you need an external scope.