Not sure about the speedometer. The belts are cheap to have replaced, and even cheaper if you do them yourself, pretty easy job really. I wouldn’t pay a shop more than $60 to replace the belt in question. A shop shouldn’t charge any more than around $60 for the oil in the spark plug tubes. Each of these jobs takes about 15 minutes for a mechanic to perform. I HIGHLY recommend that you go to an independent Japanese or Honda/Acura shop. Do not go to a chain store or a dealer for these things, they will find more things to replace on you 18 year old car and scare you into paying for them…