I don't know. I thought someone thought it was for the tach. the engine is sitting on my floor, so I can't even test anything yet. I'm still trying to find out if the dizzy will work in my 235!
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'50 Chevy Fleetline DeLuxe ('55 235)
'48 Chevy Fleetmaster coupe ('60 235)
Chicago
http://www.geocities.com/hellfish122