Engine/Transmission (1998.5 - 2002) Aftermarket Tach...?

[TxDieselKid]

So has anyone put one on? Where did you tap into the signal?



Anyone know what type of signal the CPS puts out? I would like to tap into that to run the tach.





Andrew

 

[fj40charles]

Andrew,



What are you trying to do? Are you going to install a 6" tach on the dash like the ricers?



Charles

 

[TxDieselKid]

Originally posted by fj40charles

Andrew,



What are you trying to do? Are you going to install a 6" tach on the dash like the ricers?



Charles

Sumthin lik dat!

 

[Phil Rauch]

I would like to figure out some way to put in a shift light, any ideas?

 

[TxDieselKid]

Originally posted by Phil Rauch

I would like to figure out some way to put in a shift light, any ideas?

 

[Diesel Freak]

I used an "O" Scope from work a few weeks ago and took a look at things.



I found a wire that I thought would work, but no dice. (I also scoped a few "other" things prior to my last dyno run to make sure I was..... oh nevermind)



I think the best bet is a magnetic pickup off the harmonic ballancer.

 

[TxDieselKid]

So what type os signal DID it put off from the cps? Was it on a ratio? A ratio will work out great!

 

[Diesel Freak]

Originally posted by TxDieselKid

So what type os signal DID it put off from the cps? Was it on a ratio? A ratio will work out great!

it was about 250 HZ at idle with a peak voltage of 5 V.



it was a grey black wire on the plug on the firewall above the fuel filter.



the grey black wire on the PCM (Plug C1, PIN 8 on the PCM) was only 2. 5 volts