11-27-2006, 12:33 AM | #1 |
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Join Date: Aug 2001
Location: Shawnee, KS
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6 cyl tach?
i want to add a factory tach to my dash for a 6 cyl. did the factory tachs have a switch or filter to switch between the two? parts suppliers only list v8 applications.
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11-27-2006, 01:58 AM | #2 |
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Join Date: Aug 2005
Location: Los Angeles
Posts: 1,363
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Re: 6 cyl tach?
The G.M. parts books listed 2 different numbers for 6 and 8 cylinder tachometers. I was able to have a speedometer shop recalibrate a reproduction 8 cylinder tach. to work with a 6 cylinder. The reproduction I had did have a calibration adjustment screw on the back, and there was enough adjustment to make it work with the 6. I don't know if all the reproduction tachometers are the same though.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
11-27-2006, 11:47 AM | #3 |
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Location: Lancaster, PA
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Re: 6 cyl tach?
I had a factory 6 cyl tach and no, there was no switch or filter. It looked just like an 8 cyl version minus the "8 cyl" stamping on the back. Good luck finding one.
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11-27-2006, 07:02 PM | #4 |
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Join Date: Jun 2001
Location: Shelbyville, KY
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Re: 6 cyl tach?
6 cyl tach's are around with a unique part number. The potentiometer adjustment on the 8cyl tach might give you enough to work on the 6cyl. Or, you could install a marine tach ie. Mercury makes a tach for 4,6,8 cyl selectable and it looks like it would fit fine in the truck dash. I just picked one up brand new and may try to set it up~~~.
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11-28-2006, 06:41 AM | #5 |
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Location: Portland, Oregon
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Re: 6 cyl tach?
I used a 0-6000 marine tach.... installed just fine with some modification..... was for 4-6-8 cyl engines.... will try to find pic if anyone interested........Jim
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
11-28-2006, 11:03 AM | #6 |
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Re: 6 cyl tach?
i would like to see that pic
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11-28-2006, 10:17 PM | #7 |
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Location: Portland, Oregon
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Re: 6 cyl tach?
Pic of marine tach I installed 10-15 years ago.....I have always believed in Marine instruments, gauges, switches, solenoids etc., to be of better quality than equivalent auto/truck applications. Brass cases, glass (instead of plastic lens)..cases filled with inert gas ( argon, etc.) In general marine products are pretty much moisture proof for long life in the damp/wet marine envirionment.
I do recall that I cut the printed circuit to clear the tach body.... soldered the cut traces enabling a U shaped printed circuit to clear the tach.
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
11-28-2006, 10:18 PM | #8 |
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Location: Portland, Oregon
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Re: 6 cyl tach?
BTW. the tach I installed is 0-6000 RPM
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal). |
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