a zener diode would knock down 12v to 4.7V (common one) i believe you can get others as well.
would have to be a signal not a power source tho. small currents
2000 WS6 TransAm: 408ci,317 Hand Ported Heads, 231/231 cam, ls6 intake, GT-88 Truck Manifold Kit, 4L80e,Circle D 3-Disk, , 9" w/3.25's [1017rwhp]
Current Temporary Setup (RIP)
4.8L,706 Heads, 231/231 cam, ls6 intake, GT-88 [1060rhwp]
9.92@145 [Vbox 60-130mph 5.9sec]
John 14:6, Proverbs 3:5-6