Where would the tachometer sensor be on my 2005 XJR?

I cannot find it in JTIS.

Does the crank shaft position sensor feed the tachometer?

 

You need a signal converter

A couple of ways to do it but this is an easy option
https://www.msdperformance.com/produ...ers/parts/8913

An alternate is to use a ODB2 converter

You can also use a magnetic pickup version

Cheers
34by151

 

Yep. Thats what I need.

Thank you.

 

Just an update.

Parts ordered one from Thailand so it will be a while plus driving up to Cape Cod next week to work on my "hole in the water" I actually want it in the water this Summer.

These parts will enable me to select when the SF bypass valve closes fully instead of gradually. Which I have talked about in another thread.

So this experiment will happen in about 4 weeks.

 

Another update.

Jag behaved impeccably on 900 mile round trip from MD to Cape Cod.

Wired in all the components however no luck in picking up a signal for engine revs so far.

Either the magnetic pickup is not working or I have not found a reliable wire to "sense".

I tried a red wire going to one of the COPs.

I will try the crankshaft position sensor leads next. I cannot think of any other wire to try.

Edit: Before that I will simply link the solenoid, that closes the vacuum tube to the SC bypass valve, to the pressure switch for my meth/water injection system.

It is "dialed in" at about 5 psi. So the solenoid will activate at the same time as the meth/water system.

When we get some decent weather will test drive the car.

 

Both the Coils and Injectors are negative triggered
IE they have positive power all the time and triggered by the ECU connecting to ground

The module needs to be set to "negative trigger" to work
You should be able to use pin 1 on any of the injectors or pin 4 on the coils

If you send me a copy of the module's manual I can give you some more specific advice

Its a little different for the MSD module as it is senses current not voltage
For the MSD 8913 you need to put it inline with the coil power supply.

The easiest way to test it is to remove F30 from the front fusebox. This will give you a break in the power supply for the coil harness.

Put a blade fuse holder on the MSD red wire and insert F30 into that

Now put a spade connector on the fuse holder and insert into the fusebox on the power supply side. This will read 12v with the ign on)

Put a spade connector on the MSD Red/Green and put that into the coil side of the F30

Put a lug on the MSD black wire and mount under the fusebox bolt

That will give you your signal from the MSD Grey wire

If that goes well you can then make it more permanent by tapping into the injector harness (Pin 30 on PI41) or under the fuse box (Pin 2 on EC36)


Id think the air cleaner solenoid valve trigger will be all you need though

Cheers
34b151