Timing for 80 metre standing start sprint

[mcnews]

Okay guys, we have a large collective pool of knowledge here and I am hoping somewhere amongst us is someone that has knowledge of accurate timing equipment.

Basically what I want to do is a repeatable standard acceleration test over around 80 metres of tarmac. To compare various models of ATV etc. in exactly repeatable scenario along an uphill tarmac slope on my property, a stig like standard acceleration test timed, speeds would be great also but times would do.

I am guessing I need basically a stopwatch/timer that accepts external inputs to trigger the start and stop.

Anyone ever set up this sort of rig?