So I bought a project daytona, the only guage that works is the speedo. The tach is not working at all. I have the dash taken a part and the guages out, all the connections seem secure. It can't be the speed sensor because the speedo works, right? This is my first time doing anything with guages and the repair manual I have doesn't help too much. Would replacing the guage with a different tachometer fix it?