Temperature sending unit problem.

1. Does the fuel gauge work normally, or is it slow/defective, too?

2. Make sure you are using the correct sender. There are many that fit and hook up, but have different resistance curves. Try a Standard Motor Products № TS-17.
I haven’t noticed the fuel gauge being slower than usual. I’ve already bought two senders I couldn’t tell either one worked but would the kind of resistance curve be in the manual? I’m kind of sick of buying them and i certainly don’t want to buy anymore if they won’t work.