Oil Pressure Switch
 

Anyone can provide me with some links to blogs or forums that give do it yourself guide to Oil Pressure Switch replacement? Thanks.

The fluctuation is normal. The oil pump turns faster at higher RPMs therefore the pressure increases. The pressure sounds a bit high, but that should be okay as long as you are using the recommended oil weight.

As you are looking to know the car repair is good thing. I think you can take the hep\lp of the Autozmagz.com for you mentioned issue regarding the replacement of the Oil Pressure Switch. You can check out that site may it can be helpful to you. But I think it is much better to call the related mechanic for that one.