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PostPosted: Thu Jul 30, 2009 1:57 pm 

Joined: Sat May 23, 2009 4:03 pm
Posts: 77
Location: Vernonia, Oregon
Just wondering if there are any good instantaneous MPG gauges for the pre-OBD2 vehicles? Aside from the MPGuino and anything that requires a laptop, is there anything else out there for us MK1s?


1987 Sprint turbo
1989 Dodge Caravan SE turbo 5 speed
1991 Honda ST1100
2000 Nissan Altima

PostPosted: Thu Aug 27, 2009 3:11 pm 
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Joined: Fri Aug 21, 2009 3:07 pm
Posts: 56
Location: Sacramento CA
All the MPG gauges do is relate engine vacuum to a guestimate MPG scale. Even the digital ones used in Cadillacs, and analog ones in U-Haul truck have it.

J.C. Whitney carries a simple fuel economy gauge and a boost/vacuum gauge. They both connect a nylon tube to an open port on intake.

"If it doesnt fit, use a bigger hammer"
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PostPosted: Sun Aug 30, 2009 10:20 am 

Joined: Tue Feb 10, 2009 4:09 pm
Posts: 238
Location: Brinkworth, UK
The old fashioned economy gauges used engine vacuum. Modern gauges monitor the injector pulse width and vehicle speed sensor to give mpg readings.

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