Me tool, being mine was without cigar lighter. About the most electronic thing outside of an ignition module I would put on one of these cars. Great place for a nitrous system arming switch, too!
Reason I used that hole for the line lock was it was a quickie burnout helper to save some tranny use and the line lock provided switch on the shifter made for easy 2nd stage NOS activation once launched. Like said was a smoker and always on edge so there was likely a smoldering butt in that little tray.