One time I saw four timing lights hooked up to Larry Larson's Nova (Drag Week 2011!) and there was a 5º spread on what they were reporting!!
My craftsman dial back light hasn't led me astray yet. It matches up with the megasquirt's commanded timing every time, and it's easily back checked against the crank trigger wheel tooth count and degree marks on harmonic balancer.
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)
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