Welcome Visitor! Please take a few seconds and 
adsm08
Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
- Joined
- Sep 20, 2009
- Messages
- 34,623
- Reaction score
- 3,613
- Points
- 113
- Location
- Dillsburg PA
- Vehicle Year
- 1987
- Make / Model
- Ford
- Engine Type
- 4.0 V6
- Engine Size
- 4.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Tire Size
- 31X10.50X15
OK, trying to get my gen1.5 cluster wired up to a gen2 dash harness. I have lights, fuel, coolant, oil, and charging. You know, the super important stuff.
Right now I am trying to figure out the tach, since Ford does not seem to have ever written down the schematics for the 86-88 tachs. Looking at the circuit board I have 4 pins, B, G, S, and L2.
From my experience with after market ones I am assuming that B is a 12V reference, G is ground, and S is signal. Does anyone know what L2 and S are?
If I hook power and ground to the B and G terminals respectively I get a constant reading of about 400 RPM. If I tap a grounded wire to the L2 terminal I can make the needle respond and go up matching the frequency of my tapping. The S terminal seems to do nothing.
Right now I am trying to figure out the tach, since Ford does not seem to have ever written down the schematics for the 86-88 tachs. Looking at the circuit board I have 4 pins, B, G, S, and L2.
From my experience with after market ones I am assuming that B is a 12V reference, G is ground, and S is signal. Does anyone know what L2 and S are?
If I hook power and ground to the B and G terminals respectively I get a constant reading of about 400 RPM. If I tap a grounded wire to the L2 terminal I can make the needle respond and go up matching the frequency of my tapping. The S terminal seems to do nothing.
Last edited:
