Join Date: Apr 2008
Location: Beeville, TX
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The Viper 5901, Python 991, and the Clifford 50.7x are *exactly* the same product, and they all work very well.
I had a Python 991 installed on my girlfriend's truck. It was able to use the factory tach wire without a problem. The wait to start time doesn't link to the 'wait to start' light on a 6.0l because the computer doesn't always run the wait to start light (little orange squiggely line on the dash). It always dings, but it doesn't always run the light. On a 7.3l, it would work just fine, because it doesn't matter how hot the engine is, the light, at least, will come on when you key the ignition on.
The factory setting for a 991, 5901, 0r 50.7x is either 15 seconds, 30 sec, or 1 minute or something ridiculous like that. Obviously 15 seconds is a lot better. More than you need. I found it to be too long still. The alarm place that I got mine from changed it with a device they call a "Bit Writer". It's a hand held device for changing alarm parameters. It plugs into the alarm box, and uses a menu-driven interface to change things in the alarm. It has a lot more control over the alarm than pressing the remote buttons in a sequence to change the settings on the alarm. They changed mine to 10 seconds.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance