Sushpants

That's an interesting idea. I don't know if the feedback signal could be used as a tach signal. I'll have to try it out!

Hey Dougy, I ended up moving my the fuel pump to a relay and using that aux output for the tach. You could gain 2 outputs by setting up a wasted spark setup. & ellisd1984 - The coils do have the feedback pin, but that's another aux input which the ECU is doesn't have many of.

Hey Dougy, That's what I did at first but it didn't work well for me, the tach wouldn't read higher than 6k rpms. I ended up making a video on how to diagnose and fix the tach:

I finally got to the bottom of the issue. The meter movement was the cause of the needle rising when power would be applied to the tach controller. I think in the process of me replacing the signal resistor I bumped meter movement out of calibration. I made a complete video on how to fix it and how to adjust the tachometer range: https://youtu.be/y2TRMWldaQA

I'll try unplugging the tach wire and see if it goes up on its own.

Hello, I have an Atom X g4x running my AE82 with a 4AGE 20v Blacktop swap. I've been trying to get the stock AE82 tachometer to work with my coil on plugs & ECU. First, I tried using a tach booster which worked great until the rpms were over 6.5k. I then removed the tach booster and swapped the tach cluster resistor to a 1k connected it directly to the Atom X. The tach works with the output from the Atom X but the reading is off by about 600rpms. When I power on the car, I noticed the tach needle will read about 600rpms when engine is off and only drop to 0rpms when switched off. Is there a way to adjust that initial signal or is there something else i should be doing to get the tach to read accurately? Thanks! Sushpants BTW, I'm making an Link ECU install video series for my Corolla FX16 GT-S: https://youtu.be/3GDTDJv3IC8 https://youtu.be/245fLDX0jaM