# EMU Black SW inputs ground question

**URL:** https://community.ecumaster.com/t/emu-black-sw-inputs-ground-question/5464
**Category:** EMU BLACK / CLASSIC
**Created:** [March 30, 2026, 8:52pm UTC](https://community.ecumaster.com/t/emu-black-sw-inputs-ground-question/5464 "2026-03-30T20:52:39Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Mihkel](https://avatars.discourse-cdn.com/v4/letter/m/58f4c7/32.png) [@Mihkel](https://community.ecumaster.com/u/Mihkel)
#### Post date: [March 30, 2026, 8:52pm UTC](https://community.ecumaster.com/t/emu-black-sw-inputs-ground-question/5464/1 "2026-03-30T20:52:39Z")

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EMU Black manual states to use “sensor ground” as ground input/reference for the digital SW inputs.  
Is there any issues when using regular good chassies ground next to the needed switch?  
I understand that there can be a possible ground potential difference to the sensor ground that might cause SW1-3 input false triggering and ideally correct way is grounding to sensor ground.

Theoretically how real is the problem when the vehicle has good and checked ground connections?  
ECU grounds (PGND + ECU GND) are grounded to the engine and engine is grounded to chassis.  
Any real possibility to distort the sensor readings that are connected to sensor ground while the SW1-3 is triggered when using regular chassis ground?

I’m asking because it is considerable amount of additional work/time bringing sensor ground wiring to the additional switches correctly/neatly that are now being added later after previously made ECU installation (all leftover inputs are brought near the switches before).