Tach problem

[SpooledUp]

My tach had been reading incorrectly for some time now so I finally got a recalibrated unit from Caspers and replaced it. To my suprise it did not correct my problem. The question I have is there a way to adjust this unit that I missed when I installed it? Is there any other things that I should look for that could be causing my problem? Any info is appreciated.

 

[mikestertwo]

How far off is it?

 

[pacecarta]

you dont by chance happen to have the fuel prime connector plugged into the tach connector behind the alternator-a/c compressor


if those arent connected the only other source is the ignition module , ive had some that worked and tested fine on casper ign tester but didnt drive the tach properly , the fix replace the ignition module

 

[gordyzx9r]

if those arent connected the only other source is the ignition module , ive had some that worked and tested fine on casper ign tester but didnt drive the tach properly , the fix replace the ignition module

My tachometer problem wound up being an aftermarket ignition module. It would cause my SW tachometer to zeroize if it went above 2K RPM.

 

[SpooledUp]

How far off is it?

Its off about 300 at idle but variation increases as RPM increases.

 

[SpooledUp]

you dont by chance happen to have the fuel prime connector plugged into the tach connector behind the alternator-a/c compressor


if those arent connected the only other source is the ignition module , ive had some that worked and tested fine on casper ign tester but didnt drive the tach properly , the fix replace the ignition module

That is the green and black connectors correct? If so those are definately not connected. I had replaced the ign module about a year and a half ago so that should not be the problem either but I guess you never know. I will try and swap it back with the original and see if it resolves the problem.

 

[SpooledUp]

Anyone else with a possible solution?