This will look familar as it is what I sent you in an e-mail.
I can but not the "in-the-slot" sensors I make for 1/32 scale cars. The HO cars use a pin guide which can be missed by the sensors if the car is going fast.
That leaves us using the car itself to trigger the sensors which means the use of a light bridge. I have made a few custom light bridges. If this is something you might be interested in please let me know and I can elaborate.
Visit my web site for your track timing options.