The speedo stopped working in my 87 325 eta a couple of years ago. I found a dash in a junk yard out of a 318 and put it in the 325. I can't remember what the car redlined at with the old tach. But, it easily goes over 6,000 with the one out of the 318. I'm thinking it is set up for a 4 cylinder and I am not getting the correct reading. There is no way an eta engine would rev that high, right.
How can I get it to read the rpms correctly?