aggiediesel01
Full Access Member
So on the vacuum switch... It is used on trucks with a vacuum brake booster to give a brake warning if vacuum is low. If I remember right you are converting to hydoboost. If so the vacuum switch is unnecessary for brake warning but could be left to indicate low vacuum in the hvac system if you wanted.
But remember, the dash light that turns on when vacuum is low is the Brake light and maybe the abs light as well?
On the DRL connector, the wiring diagrams show what signals go where and when they are energized so take a look at the diagrams before you wire them up. I believe you can buy that DRL module from rock auto for about $60 I've seen them on ebay for a little less but not sure if it would help with what you want to wire in.