I have the Davtron 803 clock/OAT combo in my Warrior. I had installed last year and it has been great. You can configure it to start timing by pulling one pin to ground with a squat switch or other input. It has dual Zulu/local clocks, a flight timer, an elapsed timer, and can display OAT in C or F as well as bus voltage. I would recommend it if you need those functions.