I recently (days ago) purchased a 1984 300D with a non-working tachometer (and dash lights , but a new rheostat is on the way). I have read numerous threads in the forum and am getting mixed info about whether or not my '84 uses a tach amp or not. The car was originally purchased in Hawaii, and has no tach amp in the plug, so I'm assuming it is not a CA model.

How can I determine how my tach works? Also, is there an online resource for determining your cars features with the VIN?

Thanks!