Rev counter drive and cam shaft

Spark · Post by **Spark** » Sat Feb 27, 2016 10:59 am

Hi
Help please
My car came without a Rev counter generator fitted
I has acquired one and the drive adaptor ( should have checked cam shaft )
When I came to fit and the cam shaft isn't threaded for the drive.
What options apart from getting new cam shafts ( do I need a pair?)
Or get it machined? So it fits, will this alter balance.
Or can I drive the Rev counter from another source

Thanks
Phil

abowie · Post by **abowie** » Sat Feb 27, 2016 11:02 am

Easiest solution is to get the tacho converted to a modern circuit board and fit the generator as a dummy.

Spark · Post by **Spark** » Sat Feb 27, 2016 11:04 am

Hi
Do you have any details how to swap this

Ta

PeterCrespin · Post by **PeterCrespin** » Sat Feb 27, 2016 1:22 pm

I fitted the internals from a Series 3 XJ tach. Fiddly but not complicated, then run from the coil impulses.

Moeregaard · Post by **Moeregaard** » Sat Feb 27, 2016 4:33 pm

I'm with Andrew and Pete. The tach generator is a pain in the neck.

cactusman · Post by **cactusman** » Sat Feb 27, 2016 6:25 pm

There is an excellent thread on here about converting your voltage driven tacho so the cam generator just provides an engine speed dependent ac frequency to drive the tacho. I have converted mine. Works a dream. Bit of electronic knowledge is all you need....and be able to etch a PCB helps...

abowie · Post by **abowie** » Sat Feb 27, 2016 9:43 pm

Spark wrote:Hi
Do you have any details how to swap this

Ta

If you're in the UK send it to Speedograph Richfield in Nottingham.

If you're in the US Mike Eck (jaguarclock.com) does them as well.

I have used both

Spark · Post by **Spark** » Sun Feb 28, 2016 7:09 pm

If I swap the Rev counter to electronic can you let me know how it's wired up to the gauge

Thanks
Phil

Spark · Post by **Spark** » Sun Feb 28, 2016 9:15 pm

Sorry just need the help

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