If you have the car and it has cruse control, see if it has a cable from trans for speedo or if electronic pick up. If electronic, use the cruse parts to govern engine. If the car was a stick shift, use the steel flywheel for kinetic energy to reduce variance, if auto , you will want to find a flywheel. If you have the cruse with electronic speedo you can use the speedo pick up on the flywheel for pulse input, set cruse then press accel button till at 60 cycles. It will adjust engine until shut down. If you need more info, let me know.
