I made my stock tachometer work in my '01 TJ and in an '04 TJ 10-11 years ago. I did a lot of searching at the time and as far as I could tell, mine was the first, or at least the first posted online. It still works as it should in both Jeeps. Both Jeeps have 5.3 LM7 engines. I posted all of the information that I had learned in the process on Jeeps Unlimited. All of that stuff is gone now. I also sent it to Novak when they started asking questions a few years later. I'd like to believe that their emulator is directly connected to what I had learned in the process. I contacted Advance Adapters about it as well, but they were not interested.Has anyone managed to get the stock tach to work on a TJ without an emulators, or has anyone built their own emulator? Some guy on Facebook claims to have done it, but I can’t get the results to duplicate. I’d rather not have to use an emulator if possible, and I’d rather not have to buy one.
I did not go the route of designing a circuit to send to the Jeep computer, even though that is within the scope of where I work and what I do. Instead, I went with an all mechanical setup that still uses the Jeep crank and camshaft sensors. It cost less than $100, but there were quite a few hours of machining time for a camshaft sensor trigger and for a trigger ring that goes on the GM balancer. It's not the simplest setup, but it has worked well so far. If I were to do it again, I would just purchase the Novak emulator and be done with it.