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What is voltage levels for tacho signal? I had to add quite low-ohm pull-up to OD output (to sensors +5V output) to make Subaru tacho work. Thanks for that. I don't have a problem making the tachometer work. Sitting stationary or driving slowly the tach works full range just fine. Moreover it works...

This is Weird. Proteus, 0.7 board with F4 processor. 1996 Alfa Romeo GTV V6 Turbo. Replacing AEM 308 Sequential Injection, ignition - which did not exhibit any of the following weirdness. Tachometer Lowside 12, Default Mode, Constant time, 0.5 pulse duration, 3 pulse per rev. Speedometer Digital 3, ...

Toronto, Canada M4Y

Alfa Romeo 916 V6T