Mechanical to Electronic Speedo

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Apr 16, 2012 | 09:13 PM

crazboy

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Joined: Jun 2009

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Mechanical to Electronic Speedo

Hey guys, I've got a question.
I have a mechanical transmission, and I drpped it into a 1986 Trans-Am.
Problem is that the speedometer is electronic. Now, I have tried to put in a pulse generatorm but, unfortunately, the calibration isnt correct, I'm showing much greater speeds than what I am actually doing.

Anyone know where I can get the proper pulse generator for this?
Thanks all.
Chris

Apr 17, 2012 | 01:25 AM

vetteoz

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From: Not in Kansas anymore

Car: 82 Z28

Engine: 383 SP EFI/ 4150 TB

Transmission: T400

Axle/Gears: QP 9" 3.73

Re: Mechanical to Electronic Speedo

Quote:

Originally Posted by crazboy

I have tried to put in a pulse generatorm but, unfortunately, the calibration isnt correct,
Anyone know where I can get the proper pulse generator for this?

Assuming you have a stock type VSS generating the signal ( the correct one for your year engine; there are 2 types with different signals )
you need to change the gears that drive the VSS in order to calibrate it correctly.
http://sethirdgen.org/vss.htm
Certain gear combos suit certain diff/ tire setups