What wire do you remove to use a timing light on an 88 Chevy 350 to disable the auto reset of timing?

To adjust the timing you will have to find a tan wire with a black strip. I believe the wire is either 16 or 18 gauge . GM used two main locations , RH PASS. SIDE under a plastic cover you will find the single connector, or PASS. SIDE ,remove glove box and its located in behind. You will wan't to unhook the wire,start the engine , set the timing to 0.degrees .Turn the engine off before hooking wire backup. does this wire snap into a connector under a plastic cap? and when ya remove the cover,,,do ya see a 15 amp fuse in there too also connected to a different wire next to it? just wondering if i found the right wire.