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spuggy spuggy is offline
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Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 2,828
Re: AFR Idea, need to know boost gauge voltage.

Originally posted by DRV2FST
I am interested in change my stock boost gauge (bottom of the tach) into an AFR gauge. You can buy programmable O2 sensors that will give you the desired voltage but....What is the voltage range of the stock boost gauge?
I think that the factory boost gauge reads resistance, not voltage.

If you disconnect the boost gauge terminal completely, you get full-scale deflection (1 bar on a 930 gauge).

If you ground the boost gauge connection, the needle drops to zero.

The factory manuals give the resistance of the boost pressure sender as 5-13 Ohms at 20C (68F) at atmospheric.
'77 S with '78 930 power and a few other things.
Old 06-08-2007, 08:02 AM
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