# SR20DET swapped in 240sx but tach  doesnt work

**URL:** <https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297>\
**Category:** Canada Nissan Automotive\
**Created:** [September 17, 2006, 11:20pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297 "2006-09-17T23:20:46Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![dsm\_austin](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@dsm\_austin](https://forums.speedlife.net/u/dsm_austin)\
**Post date:** [September 17, 2006, 11:20pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/1 "2006-09-17T23:20:46Z")

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I pulled a SR20DET from my 1990 240sx, it had a the KA SOHC tach with the 6000rpm redline in it and it worked perfectly.

When i swapped the motor into my 1991 which has a JDM 7500rpm redline tach(i know the tach works cause i had it in the car before the engine swap) it doesnt move and stays at 0.

I wired up the plug that comes off the ECU plugin that goes to the cluster(6 wires) So it should work. A friend dont me that the wiring can have a “diode” or something it it so it will work on the 6000rpm redlinevtach and not the 7500redline one.

I know the wiring up to the ecu is good so its something else, Any ideas whats causing this problem???

thanks for any imput

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**Author:** ![benji](https://avatars.discourse-cdn.com/v4/letter/b/f17d59/32.png) [@benji](https://forums.speedlife.net/u/benji)\
**Post date:** [September 18, 2006, 8:28pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/2 "2006-09-18T20:28:59Z")

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i think u need a dohc tach to make it work properly

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**Author:** ![TravyPoo](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@TravyPoo](https://forums.speedlife.net/u/TravyPoo)\
**Post date:** [September 18, 2006, 8:36pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/3 "2006-09-18T20:36:56Z")

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can you not just run a wire from the distributor to the back of the cluster?

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**Author:** ![GRIPPY](https://avatars.discourse-cdn.com/v4/letter/g/ad7895/32.png) [@GRIPPY](https://forums.speedlife.net/u/GRIPPY)\
**Post date:** [September 19, 2006, 3:19pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/4 "2006-09-19T15:19:17Z")

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SR has no distributer.

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**Author:** ![TravyPoo](https://avatars.discourse-cdn.com/v4/letter/t/838e76/32.png) [@TravyPoo](https://forums.speedlife.net/u/TravyPoo)\
**Post date:** [September 19, 2006, 4:23pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/5 "2006-09-19T16:23:27Z")

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my bad. i wasnt thinking clearly :oops:

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**Author:** ![dsm\_austin](https://avatars.discourse-cdn.com/v4/letter/d/e5b9ba/32.png) [@dsm\_austin](https://forums.speedlife.net/u/dsm_austin)\
**Post date:** [September 19, 2006, 5:05pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/6 "2006-09-19T17:05:57Z")

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Any ideas???

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**Author:** ![RS13](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RS13](https://forums.speedlife.net/u/RS13)\
**Post date:** [September 19, 2006, 6:17pm UTC](https://forums.speedlife.net/t/sr20det-swapped-in-240sx-but-tach-doesnt-work/144297/7 "2006-09-19T18:17:32Z")

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Run a wire from the CAS.