does anybody know where i can get a wire diagram of the oil pressure switch? i want to see if it runs in series with the fuel pump and fuel injectors... thanks

 

What year is your truck? We can probably answer that question without the diagram

 

89 chevy blazer 350 tbi... when i turn the key my fuel pump doesnt run and injectors dont run when i jump out relay switch pump comes on but injectors still dont run. thinkn oil pressure switch is bad and not letting pump run which then would make injectors run.... ive replaced ecm distributor and relay..