The car is an 88 2.5 base model that I last worked on about 18 months ago because I had a car accident. At the time I replaced the fuel pump and lines as they where weeping. I replaced the ignition unit and coils, brake pads, Battery cables and other maintenance items. The tach was always acting funny since I bought the car so i purchased a new tach board but that didn't solve the issue. Now that I have recovered enough to work on and even drive the car the tach started to work interminably and now stopped working all together. Does the 2.5 have a tech filter live the v6? I have a newer dash that i put in to check if the tach it self was bad and that didn't help.

quote Does the 2.5 have a tech filter

No tach filter on the 87-88 L4 with the DIS ignition.

Check the connections or may a new board?

EDIT - See this thread:
1988 2.5L Tachometer not working by gtxbullet
https://www.fiero.nl/forum/...130314-2-118058.html

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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

[This message has been edited by Vintage-Nut (edited 04-25-2024).]

quote Originally posted by jdv: The car is an 88 2.5 base model that I last worked on about 18 months ago because I had a car accident. At the time I replaced the fuel pump and lines as they where weeping. I replaced the ignition unit and coils, brake pads, Battery cables and other maintenance items. The tach was always acting funny since I bought the car so i purchased a new tach board but that didn't solve the issue. Now that I have recovered enough to work on and even drive the car the tach started to work interminably and now stopped working all together. Does the 2.5 have a tech filter live the v6? I have a newer dash that i put in to check if the tach it self was bad and that didn't help.

check the connection on the distributor I believe it's different from the v6 I understand better and mine was hardwired
its nost likely a dying module or a broken wire or messed up connector

Contact Forum member JGunsett for reliable, low cost instrumentation repair.