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Tach w/ MSD? |
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Joe6805 
AMC Fan 
Joined: Mar/14/2019 Location: Williamsport Status: Offline Points: 17 |
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 Topic: Tach w/ MSD?Posted: Mar/21/2019 at 2:09pm |
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Hello all,
Hope this is in the right place, sorry if it’s not. Debated between interior, electrical or engine... Gathering parts to start assembling my SC/360 this year, and have a question regarding which tach to use. Will be running MSD; 6AL box, pro-billet distributor and soft touch rev limiter. Know they now make an adapter to use the factory tach, but my question is, are they accurate when used with the adapter (if it even still works haha)? Have read a thread or two where guys used them and found the original tach was off by a couple hundred RPM. Trying to get input from those who have personal experience. My Dad and brother both have Autometer monster tachs running with the MSD. Trying to decide between one of those, and using the original tach. Thanks! Joe
Edited by Joe6805 - Mar/21/2019 at 2:16pm |
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bcsideshow
Supporter of TheAMCForum 
Joined: May/19/2010 Location: Kenosha Status: Offline Points: 1228 |
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Posted: Mar/21/2019 at 7:06pm |
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I run all factory tachs and MSD ignitions with adapters. I confirm my timing and rpm with a snap on roll back timing light. And have never seen a difference. I’m also only checking idol rpms. At the higher rpms I’m never looking down long enough to count the little hash marks.
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1969 SCRambler "B"
1970 AMX 390 Auto 1968 AMX 390 Auto 1970 Rebel Machine Project 1969 AMX 390 4SPD Project 1969 AMX 390 Auto Project 1969 Javelin 390 project 1997 Cherokee lifted 1998 TJ Lifted |
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Joe6805
AMC Fan
Joined: Mar/14/2019 Location: Williamsport Status: Offline Points: 17 |
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Posted: Mar/21/2019 at 7:15pm |
VERY good point, there!  So if I go that route, the 8920 is the one I need for a ‘71 tach? See they have a couple of different P/Ns. Thanks, Joe
Edited by Joe6805 - Mar/22/2019 at 5:11am |
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bcsideshow wrote: