C125 Dash RPM signal from MSD grid

[The Outlaw]

Hi all new to motec, just purchased a motec c125 dash, currently running an MSD grid ignition and using the c125 mainly as a dash and for logging, trying to work out how to get a tach signal to the dash from the MSD. At the moment there’s a grey tach wire coming from MSD to auto meter tach gauge, could this wire be used to send signal to the dash? If so does anyone’s know how it’s done..
Thanks in advance

[SOReilly]

You can wire the tach wire to any SPD input of your C125.

It doesn't state how many pulses per rev are generated so you might need to experiment with this a bit.

The SPD pins in hall mode are pulled up to 2.7V, it seems like your MSD box rises to 12v when active so you will probably need to set the hall voltage threshold to 4.680 V, This is in the Spd Levels dialog.

[The Outlaw]

You can wire the tach wire to any SPD input of your C125.

It doesn't state how many pulses per rev are generated so you might need to experiment with this a bit.

The SPD pins in hall mode are pulled up to 2.7V, it seems like your MSD box rises to 12v when active so you will probably need to set the hall voltage threshold to 4.680 V, This is in the Spd Levels dialog.

Thanks so much for the inf, ill give that a try

[Anthony]

Is it not possible to pickup all that info via CAN rather than using up inputs?

[SOReilly]

Last I remember the grid CAN info is not publically disclosed but yes you probably could