[Yossarian]

MDS is activated by a solenoid thats near the lifters. When my 300C arrives, I will take a look to see if there are any plugs or wires near those solenoids that activate or deactivate the lifters. If the plugs are obvious then it would be easy to wire in an indicator that shows which cylinders are in use. My guess though is that the wires that activate the solenoid are probably very hard to find. It might require taking off the heads to get to them. Ill let ya'll know what I find when my 300C arrives.