This is the part: HALL EFFECT SENDER 12-24V 4 PULSE C6001 - https://newenglandinstrument.com/product/commercial-automotive-instrumentation/speed-sensors/hall-effect-sender-12-24v-4-pulse-c6001/Most common cause of this is the speed sensor. I don't have a link but there is a company in Australia that makes the sensor. If I recall correctly it was called a hall effect speed sensor. Sorry I can't remember the company's name but I ordered one a few years ago for my 91 and it worked perfect. Even though it fixed the cruise control there were not many times I could use the cruise control on the 91. It was just to gutless with all the hills in my area.