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MSD techs are of no help to me with this one, maybe one of you guys tried:
Msd P/N 8956 RPM window activated switch

http://store.summitracing.com/partdetail.asp?part=9019

Anyone hook one of these up to a 01 civic and how did you do it? I guess there is problems with our DIS system and there being no tach out line

 
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here's some Tach info provided from WireMagic.com
TACH
The TACH WIRE is generally the negative side of the vehicle’s coil(s) or Distributor. This is required for a Remote Start installation when the manufacturer’s unit specifies a connection to the vehicle’s tach wire. It is an AC signal and generally ranges between 2-13 volts during run. The higher the engine speed, the higher the voltage will read. Any short to ground or 12-Volts on this wire will generally cause the vehicle to stop running or, may also cause the vehicle to exert erratic behavior such as " bucking" and intermittent stalling during normal operation.

2001 Honda Civic Tach:
Blue At tach test connector * This plug is located on the passenger side of the engine compartment between the battery and the headlight. Set your remote starter for 4 cylinders

 
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This info is for a remote start I dont know if it will help you

 
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yeah the RPM wire on our cars is the blue wire to the left of the battery with a black rubber boot thing on it, I've used that wire for my alarm with remote start, and also for my o2 simulator. I bet thats what you need!

 
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If you don't want to run a wire through the firewall you can get the same blue wire running into the instrument cluster. Its connector A (the green one) Pin 13.

The wire is there on all models including the DX, even if there is no tach gauge.