# CAN ANYONE ANSWER THIS? RE: SR swap **URL:** \ **Category:** SON240sx Automotive\ **Created:** [September 16, 2005, 12:53pm UTC](https://forums.speedlife.net/t/can-anyone-answer-this-re-sr-swap/88768 "2005-09-16T12:53:44Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![TorontoGT-R33](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/torontogt-r33/32/5500_2.png) [@TorontoGT-R33](https://forums.speedlife.net/u/TorontoGT-R33)\ **Post date:** [September 16, 2005, 12:53pm UTC](https://forums.speedlife.net/t/can-anyone-answer-this-re-sr-swap/88768/1 "2005-09-16T12:53:44Z")
I have a 1990 240sx and im installing a type x black top SR20 and I hear that I must change my cluster to a 1991 and up in order for it to function with the SR otherwise the RPM’s will not work. Is this true? ---
**Author:** ![dnash](https://avatars.discourse-cdn.com/v4/letter/d/f6c823/32.png) [@dnash](https://forums.speedlife.net/u/dnash)\ **Post date:** [September 16, 2005, 1:18pm UTC](https://forums.speedlife.net/t/can-anyone-answer-this-re-sr-swap/88768/2 "2005-09-16T13:18:07Z")
I thinks so. AFAIK, the SOHC tach signal and DOHC tach signals are different. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [September 16, 2005, 1:58pm UTC](https://forums.speedlife.net/t/can-anyone-answer-this-re-sr-swap/88768/3 "2005-09-16T13:58:33Z")
Don’t change the cluster, just get a tach portion from a dohc and replace the sohc tach in your existing cluster. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [September 16, 2005, 2:29pm UTC](https://forums.speedlife.net/t/can-anyone-answer-this-re-sr-swap/88768/4 "2005-09-16T14:29:04Z")
Stuff need to change but Mikes suggestion is the best way