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Old 10-27-2009, 08:06 PM
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Tach

So i have takin the simple task of installing a Tach in my truck and turned it into something i need help with. I have a 87 chevy with a Blaster coil and my tach works but reads VERY slow, i have it hooked up to what i think is the ground wire on the coil but am not sure as this wire was open and has nothing going to it.... am i on the wrong wire. There are 2 sets of clips that connect to the coil i am on the one that is on the passenger side, i tryed just for the hell of it to go to the other wire and got nothing at all any help???

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Old 10-28-2009, 10:18 PM
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Does the tach have a switch for 4-6 or 8 cylinders?
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Old 10-29-2009, 09:27 AM
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yes and when it is on 8 it is slow when it is on 6 its fast but off a little bit
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Old 10-29-2009, 05:29 PM
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How do you know it is off?? What other tach hooked up at the same time are you comparing it to?? What brand Tach do you have?? Is there an MSD box also with the Blaster coil, or are you using just the blaster coil?? What type of distributor??
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Old 10-30-2009, 08:43 AM
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its a sunpro tach, with just the msd blaster coil no box...with a msd distrib...im saying its off because i dont think my truck idles at 1600-1900 rpms
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Old 10-30-2009, 05:01 PM
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Check with MSD for info about the distributor you are using, some of the Sun tachs will not read correctly off some of the MSD stuff and require a Tach Filter/adapter. I know for a fact that the Sun Super Tach II will not read off an MSD box without the filter.
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Old 11-11-2009, 06:03 PM
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what is the filter called exactly i have found some but dont know which i need here is autozones list:
http://www.autozone.com/autozone/cat...equestid=44988
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