Shoot man, if my 86 2wd carb truck is prewired for a clock, most everybody else is too!
mine was hiding behind the stereo "taped" to itself.
Really easy to see after the morons ripped the tape deck out.
I saw it and said, "that looks like it goes here". It did, it works.
Oh ya, very easy to pop the panel off hcav control, just do it gently.
Hope this helps,
Todd

1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car