SR not running right

[ibanezxguy]

I have a couple problems. Its a 95 car with an s13 red top
My temperature is running high on the stock gage. I was told it should sit a little higher than my KA's but most people i talked to said it sits in the same spot. And i wouldnt worry about it but its the first day ive had the car back and the needle jumps all the way up.

And second i did a tranny conversion. And my speedo wraps out when im only doing about 45. How do i fix it? And plus when im running in 4th and 5th gear the car kinda sputters. It wont go any faster. I think i was maybe doing a whole 50mph in a 70 today with the gas to the floor.

Im new the SR i just picked it up from the shop today they said it should be okay and to take it easy for the first 500 miles. Im definately gonna give it back to them id just like to try to fix it tonight since its my only car and ive already been without one for a week. Thanks for any help