2.9 to 5.8 factory tach issue

merch · Nov 12, 2014

does anyone know of or have a post of the procedure for making my factory 2.9 tach read with a 351w? ive searched for threads or tech articles but not any specific how to's. has anyone doen this,and if so any pics?

RonD · Nov 12, 2014

The back of the tach will have pins you can jump but it will only get you "close" to the V8 RPMs, the V8 option was not on Ranger tachs, mid-'90 Explorer tachs had it

If you want to leave it stock then you will need one of these: http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=127/prd127.htm

Ask them to confirm the build but it should work for your setup

merch · Nov 12, 2014

Mid 90 explorers have the same dash as my 91,are the tachs different between the two?

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merch · Nov 12, 2014

RonD said:
The back of the tach will have pins you can jump but it will only get you "close" to the V8 RPMs, the V8 option was not on Ranger tachs, mid-'90 Explorer tachs had it

If you want to leave it stock then you will need one of these: http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=127/prd127.htm

Ask them to confirm the build but it should work for your setup

Ill look into that interface,thanks

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bobbywalter · Nov 12, 2014

i see your avoiding corrupting the other thread.

so one wire is black and yellow and the sig wire is tan or pink...theres several colors for them and some go thru the pcm.

if you have the blk yl at the 8 cyl and it has ground continuity, then popping it out of the plug and leaving it ungrounded should be the 8 cyl setting.

i remember some with 6/8 on the back but that may be confused with mustang and 150 stuff.

i tried finding it on the rrorc but its gone now and i have no access to it anymore.

merch · Nov 12, 2014

I remember it was posted in a tech article but I cant find it either. Ill try yo remove the 8 lug like you mentioned

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bobbywalter · Nov 12, 2014

well theres quite a few types over the ford and gm lines i have dealt with and having pulled back from this type of stuff the last 5 years its just not on the window in my tiny little mind. most rigs end up with real gauges and the factory junk is left to the trash can.

merch · Nov 12, 2014

True,but I like my dash and rraly want to keep it and have it work if ots even possible at this point.if not ill cut it out and make a new one! Haha

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2.9 to 5.8 factory tach issue

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