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by **peobryant** » Wed Sep 10, 2008 7:47 pm

Does anybody know if a factory tach will work on '91.5 intercooled Cummins? I know they don't just plug right in, but I have been told that people have even put the tachs in non I/C trucks, so does anybody know how I would get on to work on my truck?

by **peobryant** » Fri Dec 26, 2008 10:36 pm

.....

Anyone...? :cry:

by **Philip** » Fri Dec 26, 2008 11:08 pm

Your going to need to install a sensor to trigger the tach. The 91.5"s didn't have a crank position sensor.

If you use a stock tach you will need it to be a 5 volt signal also.

If you go with an after market tach then it would need a 12 volt signal. Going with the 12 volt signal would let you use any auto tach.

by **peobryant** » Sat Dec 27, 2008 5:43 am

Is it possible to install a crank position sensor on my truck? What would I have to do? I realize it would probably be easier to use an aftermarket one, but I love the look of the factory ones.

Thanks

by **Philip** » Sat Dec 27, 2008 7:34 am

You could install a crank sensor. You would need a sensor. An aftermarket magnetic type would be your best choice. Then glue a couple of magnets to the harmonic balencer. Then you could tap into the 5 volt circuit from the PCM. All your gages use 5 volts for their power source.

by **RumbleFish** » Sat Dec 27, 2008 11:09 am

yes, it is entirely possible. my 91.0 (still kicking myself for getting rid of this one) had one in it when i got it. it had the crank position sensor and everything.

by **peobryant** » Sat Dec 27, 2008 1:11 pm

Where would get a crank position sensor? Also, I'm not eletrically inclined, so how hard would one be to install?

Thanks again,
Parker

by **Richie O** » Sat Dec 27, 2008 9:07 pm

Don't you also need a different balencer. My 93 has a square recessed chunk missing. My 89 does not.

by **921stgen** » Sat Dec 27, 2008 9:43 pm

Isspro makes a couple of tach sensors.

by **Richie O** » Sat Dec 27, 2008 10:31 pm

921stgen wrote:Isspro makes a couple of tach sensors.

I have the R8912 sensor on my 89.

by **Richie O** » Sat Dec 27, 2008 10:33 pm

Richie O wrote:Don't you also need a different balencer. My 93 has a square recessed chunk missing. My 89 does not.

I thought you guys were talking about putting a factory unit on.

by **peobryant** » Wed Dec 31, 2008 12:14 am

I want to put on a factory tach, but still need more info.

I know Isspro makes sensors, but will they work for the factory tach?

by **Richie O** » Wed Dec 31, 2008 10:01 am

Well it works in reverse. A isspro will work off a factory tach harness. So maybe it will work that way also. I would call isspro and ask for a tech guy. They have always been good to me and have gone out of there way to help me.

by **peobryant** » Wed Dec 31, 2008 3:03 pm

Thanks Richie, I'll give them a call.

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Factory Tach On A '91.5

Factory Tach On A '91.5

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