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I’ll post some more information as I get time to do so. In the meantime, here are a few pictures and some video of it in action.
The board comes with 4 wires. Black goes to ground, red goes to +12 with ignition on. I suggest tapping into the radio wires for these. The remaining two wires are for tach-in and tach-out. The black with white stripe wire is tach-out, the solid black wire is tach-in. The e30 tach signal wire is typically the solid black wire near the ECU inside the glovebox. The end of this wire that comes from the ECU is tach-out of the ECU which will connect to the tach-in wire on the pcb as described above.
I’ve added a set of dip switches to allow for more functionality. DIP-1 OFF and DIP-2 OFF - the tach will sweep from idle to 8000rpm and back, SI leds only light up for a couple seconds DIP-1 ON and DIP-2 OFF - the tach will not sweep, SI lights remain on until the car is started DIP-2 ON - the unit will go into a test mode where the tach sweeps from 500 to 8000 rpm, stopping at every 500rpm increment
Video: Startup-tach sweep (DIP1 and DIP2 OFF)
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Mulhousen Motorsports |
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BMW e30 6cyl to 4cyl RPM converter |