# Gear Indicator without ecu

**URL:** <https://community.ecumaster.com/t/gear-indicator-without-ecu/891>\
**Category:** ADU\
**Created:** [March 15, 2024, 10:22pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891 "2024-03-15T22:22:04Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![AdamHenderson](https://avatars.discourse-cdn.com/v4/letter/a/a87d85/32.png) [@AdamHenderson](https://community.ecumaster.com/u/AdamHenderson)\
**Post date:** [March 15, 2024, 10:22pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891/1 "2024-03-15T22:22:04Z")

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Is it possible to display the correct gear based on rpm and GPS speed values. Obviously there is a bit of math involved and I have the gear ratios to make the calculation but not sure how I would calculate this with math channels or functions. My old AIM logger had a learning setting where you take the car for a drive and change gears and it would work it out based on speed and rpm.

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**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [March 16, 2024, 6:47pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891/2 "2024-03-16T18:47:13Z")

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I believe this could be done via a table and some time spent calibrating it.  
Number function to derive ratio and a table that picks what gear that number is.

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**Author:** ![AdamHenderson](https://avatars.discourse-cdn.com/v4/letter/a/a87d85/32.png) [@AdamHenderson](https://community.ecumaster.com/u/AdamHenderson)\
**Post date:** [March 16, 2024, 10:15pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891/3 "2024-03-16T22:15:14Z")

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Thanks, I generated the table in excel and then copied it over to the adu software. To pull data from the table do I just change the reference channel for the gear selector to the table or do I need to do some sort of lookup function?

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**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [March 18, 2024, 6:59pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891/4 "2024-03-18T18:59:36Z")

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If i’m understanding your question correctly;

On the ADU display change the ‘source channel’ on the gear indicator to whatever the name of the table you’ve created is

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**Author:** ![shuaijiapeng](https://avatars.discourse-cdn.com/v4/letter/s/f05b48/32.png) [@shuaijiapeng](https://community.ecumaster.com/u/shuaijiapeng)\
**Post date:** [July 4, 2024, 5:09pm UTC](https://community.ecumaster.com/t/gear-indicator-without-ecu/891/5 "2024-07-04T17:09:53Z")

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