Located sensor oil presure
If you have a 4.3 L its in the back left of the distuburtor . You will need a special socket to remove it their 20 bucks or so .
But the oil pressure sending units on these vehicles tend to have problems I have put in new ones that failed in a few days there just maid cheaply and it dosen't realy matter ware you get it dealer napa advanced auto .The socket is worth the money it will make life easyer
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