Tachometer
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Tachometer
Help please, my son has a 98 ford ranger with a 2.5 (if I remember correctly) it has dual spark plugs per cylinder, single overhead cam. This truck did not come with a factory tachometer and from what I have found, I do not see where there is a hook up terminal for a tachometer. My son is wanting to install an aftermarket tachometer that is capable of working with this year model truck. We tried to hook it up at the most logical place I could think of, the tan wire from the coil, but I only get about half of the input signal. In laymans terms, if the engine is at 2,000 rpm, the tach might read 700-1,000 rpm. Where do I interface to get an accurate rpm reading? Any help will be greatly appreciated, thank you. I can be e-mailed directly at dpmmsa15@hotmail.com .
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From: Salt Lake City, Utah
Did you download and print out the wireing diagrams from the tachmeter manufacturers website. Also there is an adjustment switch on the tachomemter that lets it adapt to how many cylinders there are. Also the '98 2.5 was a coil pack fired unit or so I thought. So there should be more than one coil. So the main things you need to check is that you used to correct wire to tap into, and the wireing diagrams from the manufacturers website will give you that information, and the second is to make sure you have the tachometer set to read a 4 cylinder engine and not an 8.
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Tachometer
Originally Posted by Bear River
Did you download and print out the wireing diagrams from the tachmeter manufacturers website. Also there is an adjustment switch on the tachomemter that lets it adapt to how many cylinders there are. Also the '98 2.5 was a coil pack fired unit or so I thought. So there should be more than one coil. So the main things you need to check is that you used to correct wire to tap into, and the wireing diagrams from the manufacturers website will give you that information, and the second is to make sure you have the tachometer set to read a 4 cylinder engine and not an 8.
Thank you for your assistance and I will check the source, thanks again.
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From: Connecticut
You may have to tap into the PIP signal wire (DB) which you can find down at the crank position sensor connector (or you can pick it up at pin 21 of the PCM harness connector).
Or try pin 48 (T/Y) on the PCM connector which is the actual output signal from the PCM to tachometer (if there was one).
Or, you might have to hook it up to the vehicle speed sensor (VSS) signal wire. You can find the VSS wire (GY/BK) in one of the harness connectors for the GEM, which is located behind the radio.
http://memimage.cardomain.net/member...94_69_full.jpg
Or try pin 48 (T/Y) on the PCM connector which is the actual output signal from the PCM to tachometer (if there was one).
Or, you might have to hook it up to the vehicle speed sensor (VSS) signal wire. You can find the VSS wire (GY/BK) in one of the harness connectors for the GEM, which is located behind the radio.
http://memimage.cardomain.net/member...94_69_full.jpg
Last edited by Rockledge; Nov 7, 2007 at 01:06 PM.
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Originally Posted by javlin360
Thank you for your reply. I did make sure the tach was set to 4 cyl. You are correct in that the engine is coil pack fired, with dual coils, and if I am thinking correctly, the second set of plugs is mainly for emisions for a more complete burn. I did advise my son when he bought the tach to make sure it would be compatible with the distributorless ignition system, or as the box said, DIS system. The wiring diagram it came with was not very clear in the connection, it advised to check with the vehicle manufacturor wiring diagram for the correct connection, but even the reference book I looked through spoke in generalities.
Thank you for your assistance and I will check the source, thanks again.
Thank you for your assistance and I will check the source, thanks again.
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Joined: Nov 2004
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From: Salt Lake City, Utah
On my van, there was an orange and tan wire that was for the tachometer output. It was just a pigtail connector. Are you sure there isn't a wire like that somewhere under your hood?
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