IDK if the windshiled area in a 90 is the same as a 93&94 but i THINK it is but I know for a 93&94 a 95+ can be done but its NOT a bolt in swap. All mounting brackets have to be fabbed, the HVAC system has to have a complete overhaul or just be ditched, and you will have to instal aftermarket gauges then hope it all works. I've planned on doing this to my 94 but since its such an extreme project that requires your vehicle to be parked for a few days, im waitin till i have another ride for about a week or two..