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Joes924Racer · Posted: Sun Jan 20, 2013 8:27 am Post subject: No more stock ignition box & tach

Yrs ago when i installed my MSD ignition i just left the
old na ignition module in place and ran the tach off the
wire that ran to it. I pulled the ignition module and
pulled the wires. Tach wont work.

Can someone with expertise in this area tell me how
to wire the tach with the msd short of having to get a
msd tach adapter. Need to have the tach working.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

Joes924Racer · Posted: Sun Jan 20, 2013 10:05 am Post subject:

Found this on pelican parts.

Our 924s have VDO tachometers in the instrument panels which do not understand multiple sparks. The good news is that MSD sells a "tach adapter", part number 8920. There is no way around this. Just order it when you order your MSD 6 unit.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

Fifty50Plus · Posted: Sun Jan 20, 2013 11:55 am Post subject:

What a conundrum

_________________
1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

Modoc · Posted: Sun Jan 20, 2013 1:10 pm Post subject:

Sorry for my ignorance but why not just get the MSD part?

After doing some research with some ideas I had, I found a Ford Mustang Forum talking about the same problem:
http://vb.foureyedpride.com/showthread.php?t=95560
They never came across a good solution and the poster gave up and bought the unit after trying some resistors and such.

Edit: Found this as well

http://forums.pelicanparts.com/porsche-911-technical-forum/342473-msd-install-questions.html

Have you tried just hooking it up? what does happen? I'm not sure if they are similarly wired as the 911 from the same time period.
_________________
Proud owner of
'88 924s - Sold
'01 ML430
'97 Honda Civic

Joes924Racer · Posted: Tue Jan 22, 2013 9:54 am Post subject:

.A question asked for amusement, typically one with a pun in its answer; a riddle.

yea I know .. I have the msd part on the way ... from ebay.

The tach was working when i had the wires from the stock box in.
i thought maybe there was a way. Sorry man.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

daniel · Joined: 18 Jun 2009 Posts: 686 Location: Sydney, Australia

depending on what type of triger is in the dizzy try connecting the tacho wire to the neg side of the coil
_________________
Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet