Using an external source of vacuum helps. No need to have the engine idling for an hour or more while dialing in the adjustments. Just check to see that your car and the vacuum pump are providing similar amounts of vacuum.
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If it breaks. I didn't want it in the first place.
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69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN.
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