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Click on image for the lowdown. 
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| | | Forums66 Topics128,154 Posts1,056,861 Members48,456 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2009 Posts: 311 'Bolter | | 'Bolter Joined: Aug 2009 Posts: 311 | The tachometer I am looking at is calibrated for a "std pt ign, 2 IMP/rev, 6 volt pos or neg grd".
They also have them for 1 & 3 IMP/rev, which one should I use? | | | | | Joined: Feb 2004 Posts: 29,851 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,851 | Use the 3 impulse per rev item. It takes 2 turns of the crankshaft to make 1 turn of the distributor so the 6 cylinder distributor will open the points 3 times every crankshaft turn. The tach signal comes off the distributor side connection of the coil.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Aug 2009 Posts: 311 'Bolter | | 'Bolter Joined: Aug 2009 Posts: 311 | Thanks Jerry, without your help I surly would have ordered the wrong one!
Curt | | |
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