Hello

I have a little problem with connecting the M&W pro 10. We have connected all the wires but one. The small blue wire is the tach signal from the ignition box. This will tap into the dark blue wire on your distributor and provide the signal for the factory tach to work. The only problem is you guys use a OBD2 harness and i have a OBD1 harness. What wire should i use so i can activate the factory tach. I can't find any thing on the internet about it. Could you please tell what wire i can use from the ecu or what color off wire by the OBD1 ignition/ Distributor. I use a OBD1 ignition.
I hope you can give me a answer back because that's the only wire i have left over to activate the M&W.