# More than 16 analog inputs for 1970 Mustang restoration

**URL:** <https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540>\
**Category:** PMU\
**Created:** [October 7, 2025, 10:25am UTC](https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540 "2025-10-07T10:25:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![holger](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/holger/32/4649_2.png) [@holger](https://community.ecumaster.com/u/holger)\
**Post date:** [October 7, 2025, 10:25am UTC](https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540/1 "2025-10-07T10:25:35Z")

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Hi everyone 👋 ,

I’m restoring a 1970 Mustang 🏎 and want to replace the entire (unreliable) electrical system with a single PMU while keeping the original switches. I count 20 switch states (key ignition, headlamp, turn signals, horn, … excluding sensors). As far as I know both PMU16 and PMU24 offer only 16 inputs that I could use.

What’s the recommended approach to connect additional switches?

Thanks for any guidance on proven setups. 🙏

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**Author:** ![noon.engineering](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/noon.engineering/32/7208_2.png) [@noon.engineering](https://community.ecumaster.com/u/noon.engineering)\
**Post date:** [October 7, 2025, 11:07am UTC](https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540/2 "2025-10-07T11:07:17Z")

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You can connect multiple switches to an analog input using a series of resistors. ECUMaster make a “mux switch” part that allows wiring 3 switches to a single input.

Alternatively, you could use a CAN device with additional inputs, like the CAN Switch Board.

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**Author:** ![holger](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/holger/32/4649_2.png) [@holger](https://community.ecumaster.com/u/holger)\
**Post date:** [October 7, 2025, 2:38pm UTC](https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540/3 "2025-10-07T14:38:28Z")

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👍 That is so simple and effective! I like it. Thanks for the quick reply.

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**Author:** ![HWS](https://avatars.discourse-cdn.com/v4/letter/h/858c86/32.png) [@HWS](https://community.ecumaster.com/u/HWS)\
**Post date:** [November 5, 2025, 8:47pm UTC](https://community.ecumaster.com/t/more-than-16-analog-inputs-for-1970-mustang-restoration/4540/4 "2025-11-05T20:47:08Z")

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I would use a CAN Switchboard to wire most of the switches. Mount it as near as possible of the switches and go to the PDM only the CAN wires.