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05-08-2006, 08:29 PM
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#1 |
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Registered User
Join Date: Apr 2006
Location: Cuba, IL
Posts: 68
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Tach on 250 6
I just got a tach conversion kit from LMC. On the box it says V8 s only. does this mean it won't work on my 250 straight 6. it didn't say that it won't work in the catalog.???????
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05-08-2006, 08:51 PM
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#2 |
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State of Confusion!
  
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,083
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Re: Tach on 250 6
The tachs are different between the two internally, what the difference is I am not quite sure. A V8 tach wiill give you the incorrct RPM readings.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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05-08-2006, 08:51 PM
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#3 |
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Registered User
Join Date: Mar 2005
Location: Just outside Durham, NC
Posts: 894
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Re: Tach on 250 6
I actually just did this install on my 250, I pulled my tach apart and there was a switch behind the housing that allowed you to select 8, 6, or 4 cylinders.....but if the packaging specifically states V8 only, you might not have that option, but it might be worth a look.
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1969 SS 350 Camaro Sold 2008 1970 3/4T K20, stock height with 33's, 250 I6, 3 on the tree, and locked front and rear 4.10's  1980 Chevy Malibu 2 dr Sold 2007 1993 Olds. Cutlass Ciera Wagon Traded 2006 2003 Saturn L200 w/5pd. D/D My list spans 5 decades with One common thread.....GM! |
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05-09-2006, 12:32 AM
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#4 |
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Registered User
Join Date: Feb 2004
Location: Idaho
Posts: 4,034
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Re: Tach on 250 6
These are really expensive if you find a v-6 tach, especially an original one
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"Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!" |
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05-09-2006, 01:43 AM
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#5 | |
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Senior Member
Join Date: Aug 2005
Location: Los Angeles
Posts: 1,349
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Re: Tach on 250 6
Quote:
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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. Last edited by Bob B.; 05-09-2006 at 01:44 AM. |
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05-09-2006, 01:59 AM
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#6 |
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Junior Member
Join Date: Jun 2000
Location: Oakridge, Oregon
Posts: 138
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Re: Tach on 250 6
hmm..i dont have my tach hooked up yet,and it was a v6 original one...guess it may not work with the 8 in there now.maybe if thats the case,we can trade?..lets see what everyone thinks
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05-09-2006, 03:10 AM
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#7 |
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Registered User
Join Date: Feb 2004
Location: Idaho
Posts: 4,034
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Re: Tach on 250 6
As far as I know the original v-6 tach and the original v-8 tach were not interchangable for some reason, but what I do know for sure is that your v-6 tach is extremely rare and hard to come by
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"Remember, They can Kill You, but they can't eat You, That's against the law!!!!!!!!!" |
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05-09-2006, 04:07 AM
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#8 |
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Senior Member
Join Date: Aug 2005
Location: Los Angeles
Posts: 1,349
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Re: Tach on 250 6
The 1968 GMC parts book says that there was one tach. for V-8's, part# 6468228, and one electric tach. for all 6 cylinders, part# 6468321. That one works on both 250 straight 6's and 305 and 351 V-6's. There was also a mechanical tach. for the V-6's. The V-6 has a tach. drive off the back of the camshaft.
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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. |
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05-09-2006, 10:39 AM
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#9 |
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Junior Member
Join Date: Jun 2000
Location: Oakridge, Oregon
Posts: 138
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Re: Tach on 250 6
ahh i see...mine is looking like the electrical tach...since i have a long heavy single wire coming out of the firewall to where it was hooked up to the coil
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