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- Mon Mar 14, 2016 11:17 am
- Forum: General support questions
- Topic: Tachometer pull up resister??
- Replies: 5
- Views: 21819
A pull up resistor is merely a resistor - I'd suggest a 10kOhm 1/2W carbon film or similar (not wirewound - if they still exist!). It should be connected between the tacho's signal wire and its +12V supply. It sounds like your ECU has an open collector output for the tacho, and your tacho does not h...