In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jim Fouch wrote:

I just bought a 2000 GMC Safari w/ a 4.3 V6. It has no tach. I'm thinking of making one using a SX28. 
 

Any ideas the best way to pick up the tach signal? I'm thinking of using a 3.9V Zener Diode to chop down the signal to someting the SX can handle.

 

I'm also thinking of adding a gear display, but I don't think it's going to work too well when the torque converter is not locked up. 

 

Another Idea is to get an interface chip that talks dirrectly to the OBD-II port, read & display the info with the SX.

 

Jim

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