I will be updating my engine really soon and I will need new guages. I currently have an 83 TA with an 85 mph speedo and 6 grand tach. I know when I get the 350 in, I'm going to need about a 120 mph speedo and 9 grand tach. I want to get one out of a later model f-body but I've been told they are electric and mine is a mechanical. Can I convert an electric to a mechanical. Do they make bigger guages that will fit. I don't want to go out and spend a ton on some aftermarket or autometer setup. Please help me out! Thanks!

Steve