1990 4runner o/d off light in dash

hello anyone get this before? i have a 1990 v6 sr5 runner my o/d light is flashing off and on it will come on constant when i press the button for it but when the button is in the light flashes..... this just started so i would like to fix any problems asap....please reply here or at kbopra@aol.com

Yeah, you have a problem with either your speed sensor or speedometer. Basically the Speed signal is not input into the ECU or computer for at least 8 sec's whenrunning RPM between 2750 and 4000 during high load driving. There is an open or short in the speed sensor circuit, you just have to find it. Hope that helps~