First there is no sensor for the tach. It gets it's signal for the ECM. You should check the connection on the back of the speedo-tach panel for corrosion.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat
im just cheap, and cheap makes you creative.