I purchased a boost guage in the marketplace and it's missing the guage mount screw that attaches the guage pod to the back of the tach. I need to know what size this screw is.

Also, the guage is correct but he was using it in an R56 and the boost pressure sensor is different looking than the one used for my R53. On the Alta site the picture of the pressure sensor for the R53 is round and the R56 is rectangular. I have the rectangular pressure sensor. Will this R56 pressure sensor work for my application?

Thanks in advance for any comments you may have.

Chad