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post #1 of 6 (permalink) Old 01-31-2011, 08:06 PM Thread Starter
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Rpm Switch

Hi all, I recently had a 98 Mark VIII engine installed in my 94 Bird 4.6, it has the stock 94 computer and harness, what I need is a RPM switch, I need to know which one works for my application and how it's hooked up. Thanks, Steve
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post #2 of 6 (permalink) Old 01-31-2011, 09:20 PM
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MSD P/N 8950. Does the '98 run the cable actuated IMRC's or the vacuum operated ones? I can't remember off the top of my head.

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post #3 of 6 (permalink) Old 01-31-2011, 09:48 PM
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post #4 of 6 (permalink) Old 02-01-2011, 08:48 AM Thread Starter
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Thanks guys, just 1 question, how does it plug in to intake? is there a sensor on the manifold that it plugs into?
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post #5 of 6 (permalink) Old 02-01-2011, 08:59 AM Thread Starter
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went to Jegs found the rpm switch p/n 8950 but it said an RPM Module is required, is this true with my application?
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post #6 of 6 (permalink) Old 02-01-2011, 04:20 PM
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Quote:
Originally Posted by TRex94 View Post
Thanks guys, just 1 question, how does it plug in to intake? is there a sensor on the manifold that it plugs into?
It will need to be wired in to operate the IMRC controller. With the vacuum operated IMRC's it was as simple as applying/removing -12V (ground) to the vacuum solenoid. I haven't looked into controlling the cable operated ones.


Quote:
Originally Posted by TRex94 View Post
went to Jegs found the rpm switch p/n 8950 but it said an RPM Module is required, is this true with my application?
Yes, you'll need the "pill" for the rpm point at which you want the switch to activate. Typically on a stock 4V, anything in the 3200-3400rpm range is a good choice.

Rod @ AzzKicker Cars
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90 XR7-The Meth Addict-KB SC'd 5.0L DOHC Stroker
2004 Mustang GT-The Driver-Intake/Exhaust/3.73's
1995 F150 4x4-The Mud Toy-5.0L/4R70W/33's/Warn 8274 Winch
94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
2 - 90 35th Anny Ed SC's
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