| Mounting of the odometer and gauges are different between 1990 and earlier gauge clusters. The reason I had these out is because I've been working on creating custom gauge faces that will be able to show speeds up to 200 mph. Once done I should be able to offer them for sale along with calibrating your current speedometer to match. I'll have a writeup about calibrating the speedometer in a few days. 
Here is how the odometer location looks for the 1990.
 And here is how the odometer location looks for 91-93.

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