Looking to get an idea of costs for installing some gauges

What would one expect to pay a mechanic for fitting say Oil/pressure and boost gauges?

 

What type of gauges? (Electrical or mechanical?)

What make? some take more fitting than others?

Also, unsure if a mechanic is what you want, an auto electrician might be better.

 

My local subaru specialist quoted me £200 to fit prosport gauges. Ended up doing it myself not due to the cost just because I could they are not hard to fit. The only tricky bit is the oil temp sensor. A crows foot spanner did the trick