I did make my own led tailights, I put a ballast resistor in after and the abs light went out, just as a trail run I put another resistor on the passenger side light. Just need to take er fir a spin. Could the abs light cause the weird rpm thing?
If the abs light is on there is a code. If OD is not flashing it may well be the sensor in the diff causing the abs. If you're getting a flakey VSS it could cause shifting issues. Sometimes referred to as "limp" mode. This is done to protect the trans. I'm not an absolute authority on limp mode though, a trans expert will have to chime in.
Not much sets off the ABS light more then air in the system or a faulty VSS in the rear pumpkin. It doesn't necessarily set a code but it does mean that the RABS system is turned off. With LED's on the truck EACH bulb needs it's own resistor. This only pertains to the two stage bulbs (brakes [rear] and turning bulb [front]). Places like superbrightleds.com sell bulbs with the resistors built into the bulbs. Or you can install a digital turn signal relay.
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