Since our Z32 engines pump some serious power, almost all of us have
been introduced to the rev limiter. The rev limiter is the safety feature
that cuts down RPMs when the limit is reached. If you do much autocrossing,
drag racing, or just like to gun it from time to time, a shift light might
help you. The solution is to shift before the rev limiter kicks in, and
having an adequate warning system could mean the difference between winning
Installation of these products is relatively simple and requires no
drilling and only standard tools.
Before you begin, locate all the connections you will have to make,
and consult your service manual.
Parts required: (1.)
#1 MSD RPM Activated Switch - part # 121-8950 price - $48.99
#2 MSD RPM Module Selector (6000-8200rpm range in 200rpm increments)
- part # 121-8672 price - $43.99
#3 VDO Mega-lite shift light (2.) - part # 918-600895 price
All above parts can be purchased @ JEGS
10ft - 16 gauge wire
3 wire-splicing clips
Note: VDO has just released its Mega-Lite, which has 8 red LEDs arranged
in a circle with a switch to select high, low, or off.
1. Disconnect the negative battery terminal.
2. Find wire #7 for those with Service Manual, for others it's a YELLOW/RED
wire that is 4th from the center screw on the ECU. This is the TACH wire
(RPM sending wire). Use one of the splicing clips to connect to it. Keep
in mind that ECU is flipped over. (3.)
3. Locate the +12V ignition switched wire, to power both the RPM Activated
Switch and the VDO shift light. There is one right below the steering column.
Remove the panel (1ft/1.5/ft down by your knees) by taking out 4 10mm bolts.
Find the WHITE wire on the big WHITE harness & splice into it for switched
power. Sorry the pic is blurry. (4.)
4. Take the MSD RPM Activated Switch, and look at it's wires. RED is
+12V ignition switched power (draw power from WHITE wire @ WHITE harness
by the steering column), YELLOW goes to VDO Mega-lite YELLOW, WHITE goes
to the ECU YELLOW/RED, GRAY is unused. Black is ground - of course, and
gives ground for the whole assembly.
5. Shift light has a RED and YELLOW, RED is for +12V power source, YELLOW
goes to RPM Switch YELLOW. RED can be spliced into MSD RPM Activated Switch
RED, and draw power from there.
6. Carefully extend wires, and place units at your liking. My light
is sitting on top of the steering column (5.), while MDS components
are down by the ECU. RPM Activated Switch is invisible, it's tucked
under the rail, where the red wire is (6.).
7. Before you put all the wires and parts back together, reconnect the
battery & test to see if the light is working. Over 6000RPM and............BAM!
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