My check engine light always is on and the only code it pulls ia a 'clutch circuit switch problem'. It went on after i drilled out the restriction in the hydraulic line. It is a free mod you do so you can quick shift the pre-2001 T-56 cars. I can't figure it out. Any one else had this problem or know how to fix it? Thanks for any input!

 

that code has no relation to the drill mod, since the clutch hydraulic system has no sensors to monitor it. Its most likely your clutch on/off pedal switch. Thats the switch that is at the top of the clutch pedal, which comes out when you depress the clutch to the floor. This is the switch that won't allow you to start the car if you don't have the pedal pushed down.

Thats the only electrical item on your car associated with the clutch itself.

 

Thanks