Late DME and engine harness with early tach
06-02-2009, 10:09 AM
#1
Pro
Thread Starter
Join Date: Jun 2001
Location: Westport MA
Posts: 649
Likes: 0
Received 0 Likes
on
0 Posts
Late DME and engine harness with early tach
Any info on how to make this combo work? I saw one post about some kind of filter that was required, but I'm not sure exactly what they were describing.
Engine is '86 USA with its DME and harness. The tach connector from the DME is a red 2 male spade pin. Car is an '82 euro.
Thanks for any help
Engine is '86 USA with its DME and harness. The tach connector from the DME is a red 2 male spade pin. Car is an '82 euro.
Thanks for any help
01-22-2010, 02:10 PM
#3
Race Director
make a jumper for both wires. The early car harness uses a plug as well, but the connectors are different. Just look at the wires and connect them. I run an early tach in my early chassis, but use a late harness. I could have spliced, but chose to make a couple connector wires. I have not had any issues in nearly 10 year of racing like this.
01-22-2010, 02:31 PM
#4
Drifting
Join Date: Jul 2002
Location: goodlettsville,tn
Posts: 2,476
Likes: 0
Received 0 Likes
on
0 Posts
The only thing you have to do is use the early harness. I have done engine exchanges, putting late engines and dme's in early cars before. Tach always worked with no problem. If you have a even later engine with the oil level pick-up, just use the harness off of a 87 or 88 924S. Anyway, the tach is ran off of the DME.
01-22-2010, 06:33 PM
#5
i have a 85 tach with the 6 pin connector plus a red and green black connector it also has a mpg gauge and im wanting to put it in my 86 dose anyone have a diagram for the 85 tach wiring ive searched only to find nothing
i see the 86 shares a couple wires wires like the 85 but not all of them are the same
i see the 86 shares a couple wires wires like the 85 but not all of them are the same
Last edited by mike10562004; 01-22-2010 at 07:04 PM.
Trending Topics
02-09-2010, 01:30 PM
#8
Burning Brakes
Bummer, looks like the VW guys have become more useful than rennlist! Could you share your solution? I am having the same problem using an early tach on a late wiring bundle.
02-09-2010, 01:32 PM
#9
Advanced
Join Date: Jan 2008
Location: Golden, CO
Posts: 91
Likes: 0
Received 0 Likes
on
0 Posts
02-09-2010, 06:18 PM
#10
Pro
Thread Starter
Join Date: Jun 2001
Location: Westport MA
Posts: 649
Likes: 0
Received 0 Likes
on
0 Posts
I found that nothing special was required. My tach died recently, but I'm assuming it was some other problem not related to the early/late mix. The tach gets its signal from the coil, nothing fancy.
02-11-2010, 10:27 PM
#11
Drifting
Join Date: Jul 2002
Location: goodlettsville,tn
Posts: 2,476
Likes: 0
Received 0 Likes
on
0 Posts
Tach should work with no problem. I have done several swaps putting late engines in early car. I use the late dme, airmeter, and injectors. I use the early fuel rail, and dme harness. Just got done putting a 88 engine and dme in a 83 tub.
02-12-2010, 03:04 PM
#12
