secondary trigger used for wheel speed?

[PG]

Hi all!

Does anyone know, if i could use the secondary trigger input as wheel speed? I mean disconnect the second lm1815 from the CPU secondary trigger input and connect is to the PS2 clk? can it work?
Because i don't use the secondary trigger, but is have all the things on the board,and have a lot of vr sensor, and maybe i can use bolts end on the wheel (holdig the brake disc), triggering the vr sensor?

Any idea?

thanks!