Hello, I am new to this forum. I have a 90 formula that was originally a tpi 305 converted to a tbi. So far it is running good but my speedo does not work. I need to install a vss buffer as the tpi had one in the ecm? Can anyone help with this? Any help is greatly appreciated! ! Thanks. The reason for TPI to TBI was a ton of issues related to TPI. Knock sensor, Fuel, and timing just to name a few. Does anyone know where I would add the VSS Buffer and which buffer is needed?

 

I would swap back to TPI, but each his own.


read this (is not a guide, but will help you grasp the concept)
https://www.thirdgen.org/forums/elec...-odometer.html


Find a buffer box out of a 90-92 f-body, make sure you get the connectors with it. When you have the buffer and you have read the thread above, if you still have questions came back to this thread and I will help you.