the guy wants $300, its an S4 5 speed gots the balconey wheels 5 lug (what option is that)
1) the car runs, and there is no smoke, but the engine makes a ping sound. << (car runs slow) what could be the problem?
2) the oil pressure gauge dosent work, could this have any thing to do with the ping noice?

thanks in advance

 

Your oil pressure gauge problem could be do to this little guy (see pictures.) Make sure the wire is connected to it. I am think it is a resistor.