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Where have you been looking ? RPM signal for what ?
The IPC displays the engine speed as determined by the BCM via a class 2 message. The BCM receives a class 2 message from the PCM indicating the engine speed. The tachometer will default to 0 RPM if:
• The PCM detects a malfunction in the engine speed sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of class 2 communications with the PCM.
The CKP sensor is used for ignition timing, the fuel injector timing, misfire diagnostics and tachometer display. The CKP sensor is connected to the ECM by a signal circuit and a low reference circuit.
The instrument panel cluster (IPC) displays the engine speed as determined by the engine control module (ECM). The IPC receives a serial data message from the body control module (BCM) indicating the engine speed. The tachometer will default to 0 RPM if:
The ECM detects a malfunction in the engine speed sensor circuit.
The IPC detects a loss of serial data communication from the BCM.
vast ideas i have on any 91 i restored one ground up...... first off , what transmission? and does it have a tachometer, if the tachometer goes dead , even cranking the ECU will think no spark and cut fuel in 3 seconds, nostarts are covered here fixkick dot com
there is no need to guess. ask for help, not throw expensive parts. .
I really cannot tell you how to do that. You need to follow the instructions that came with the tachometer.
Please note: I would be very cautious about connecting aftermarket equipment into your computer input or output circuits. These things have been known to cause all kinds of drivability problems as well as make it impossible to pass an emissions test (if it is required where you live).
I have personally seen aftermarket add-on equipment cause everything from engine cylinder misfires to transmission shifting problems to engine stalling and no-starts. I do not recommend using any at all. However, there are usually no problems created by "stand alone" accessories that are powered directly from the battery and do not require splicing into any of the computer circuits.
My professional recommendation on this is that if you think you need a tachometer to operate your vehicle, or you just like the looks of a tachometer bouncing up and down, then you would be money and headaches ahead to buy a vehicle that is equipped with a tachometer from the manufacturer - you may be opening a can of worms that you do not want.
This is just my opinion based on 37 years of experience diagnosing and repairing automobiles (and having to clean-up aftermarket add-on messes) - do with it as you wish.
If it is an aftermarket tachometer then you may have to install the resistor that came with it. If it didn't come with a resistor ask an auto-electrician about it, they should know. If it is a factory tachometer you may also be able to try and install the resistor onto coil wire at the back of the tachometer. if you haven't got experience in this area i would suggest you find someone who does.
its really easy im not to familiar with that vehicle but it all works the same if it hasd a distributer and a seperate coil or even a dis cap mounted coil either way there is two wires that run into that actual coil all you have to do is tap into them and figure out which way works just pull back the unsulation on the two wires that your tac will come with there might be 3 but one will be a ground and just kinda half way hook it up till you see the tac come to life its really easy just be patient and dont worry if the wires are wrong it wont blow anything up the tac just wont work until you hook it up right 9 times out of 10 when you buy a tach it comes with directions