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1994 Plymouth Sundance 2.2L
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Fairly recently I came into possesion of a '94 plymouth sundance which was equipped with the non-tach gauge cluster. Over the past two or three weeks I pulled a tach gauge cluster from a '91 shadow highline sitting in a junkyard and have been trying to make it work, but the tach is not functioning.

What steps should I be taking to make it function correctly? Or is this a waste of time?

Also to add, my car is an NA 2.2L. The shadow I believe was a 2.5.
 

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Welcome To TD!!!
The tach is operated by the engine controller through the tach drive module that sits at the top of the PCB.

1)Do you have a wire in Cavity 43 of the SBEC? (GY/LB wire) If Yes, continue...
Font Parallel Rectangle Pattern Document

2)Is there a wire present in the R/S cluster connector Cavity H? (GY/LB wire) If Yes...
a)With the engine running check for voltage at Cavity H of the R/S cluster connector.
Voltage should read approx. 2 volts AC. If the voltage is present, continue...
Font Parallel Circle Number Pattern
Slope Rectangle Line Font Parallel

3)Is the tach drive module present on the PCB? If Yes, continue...
4)Do you know if the tach was working previously?
a)Cracked solder joints on the PCB are/were a common occurrence, if that is the issue you will need to reflow the solder joints on the PCB.
b)Oxidation on the PCB where the Tach Drive Module slides on/sits on the PCB is also a common problem.
91% Rubbing Alcohol should clean that up.
PCB without Tach
White Line Font Auto part Parallel

PCB with Tach
Font Line Engineering Auto part Parallel
 
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