problem with the cutoffs is that experienced thieves expect them on hot rods and owner built cars, so if they don't just tow it away they will immediately sweep all the usual "hiding" places under the dash and around/under the seat. They know the likely location is going to be within easy access by the driver. Putting it under the dash is like "hiding" your spare house key on top the door trim, under the welcome mat, or in one of the fake rocks alongside the door. Might as well leave it sticking out of the lock! I would look for an unusual or disguised location, i.e. behind the ashtray, or disguised as a dashboard switch, a volume **** on a dummy radio face, or heater fan switch with a matching **** complete with label or symbol. You can use a light duty switch to trip a remote heavy duty latching relay or to ground the hot lead to the coil or points to prevent starting.