Hello, I've got a 1988 Chevy Silverado. It runs fine and all the guages work. When I drive, the speedometer starts out working fine, then sometime in the trip the speedometer quits and shortly after the Service Engine light comes on. I pulled a code 24 "vehicle speed (vss) sensor circuit fault". Can I test the sensor in the transmission or do I have to take it off? Or do I just replace? Does transmission fluid come out when you take the vss off? Thankyou.