No rpm and oil \ brake ,abs lights on ,some time

Im been having same problem. So far it since to be ABS Module. I will recommend to have reading of ABS with a code reader with abs reader. regular code reader wont work. In my case i need to replace ABS module, but maybe in your case could be a wheel sensor, a cable, rotor,etc. If you need an abs module best thing to do fix it with http://www.modulemaster.com/en/services/abs.php. dealer price is $1400 and so it's either dealer, junker (EOM PART USED) or repair.
Good luck!