I can't remember ever seeing any switches on the transmission in any 90s honda other than the reverse light switch assembly. Are your reverse lights functioning? It may be that the same switch that tells the reverse lights to come on has a dual funtion that tells the ECU it's in 5th. But that's just dumb speculation. The work I've done is probably 90% domestic cars.
I know that my '83 civic has a duel function switch, it confused me at first, but it has an extra wire coming off it, and it's something like half way pushed in tells it that it's in 5th, I would dubble check the switch, and also make sure you got the right tranny, becaus if it's wrong it wouldn't have the little rod to push the switch.
so how fast is yoru engine going at 65mph?
The upshift indicator on the VX does not use a switch - it uses the inputs from the ignitor (engine RPM) and the VSS (wheel RPM) into the ECU to determine which gear you are using. It then determines when the upshift indicator comes on. All this is done internal of the ECU. I want to say that my upshift indicator came on on my VX in 5th too - I can't be too sure though, because when I owned it, I paid no attention to it.