Location of RPM signal on 1991 300SL?

performance_3000

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Hi, hope someone can help!
We have modified a 1991 300SL (129 chassis) by installing a supercharger and custom ECU (as well as the usual engine upgrades).
The only problem we have now is isolating where the signal goes to the clocks for the RPM counter.
We have an output on our ECU with nowhere for it to go and as the original wiring/ECU is no longer in use the RPM counter no longer has any signal going to it.
We checked on the paid online Mercedes system and there is not one single circuit diagram for the vehicle!
Is there anyone here that can help, please?

Many Thanks, Dave. Performance 3000 Ltd
 

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