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Orlando_87GN · 03-24-2008, 08:43 AM

You'll need one of these to reduce the speed on the cable for an accurate ECM MPH reading. I don't understand how your speedo in the dash is already accurate, might want to ask Ted how he hooked it up. You'll need to figure out if you have 3.90 or 4.10 gears (was the car auto or manual?) and calculate your tire size to come up with a percentage at which you'll need to slow down the speedo gear with the little gear box.

03-24-2008, 08:43 AM	#2 (permalink)
Orlando_87GN Resident Idiot Join Date: Sep 2000 Location: Orlando, FL USA Posts: 10,368	You'll need one of these to reduce the speed on the cable for an accurate ECM MPH reading. I don't understand how your speedo in the dash is already accurate, might want to ask Ted how he hooked it up. You'll need to figure out if you have 3.90 or 4.10 gears (was the car auto or manual?) and calculate your tire size to come up with a percentage at which you'll need to slow down the speedo gear with the little gear box. __________________ Check Out MikesStuff4Sale.com to view my used parts! ------------------------------------------------ 1987 Buick Grand National Budget 4.1, 204/214 cam, TA-49 Turbo, Stockish Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, Translator plus Extender powered. 3680# with pilot ------------------------------------------------ 1993 Mazda RX-7 4.1 Buick Powered 11.20 @ 128mph (2.4 60')!