I did do a little painting also. But just purple power, soap water. I had done cleaned a couple times but had not my fire wall since I took the a.c out. Still have more to do.
Read through this thread. There is some into on the speed sensor on the back of the speedo. If you still have the dash harness and plugs that went to the stock ecm, we should be ablt to tie that speeed sensor wire to the vss input on your FAST harness.